A reciprocating bolt assembly has delayed blowback and a firing pin block. Features prevent out-of-battery firing, when the bolt assembly is not fully engaged to the firing chamber or barrel face, a movable member within a bolt body functions as a blocking member that blocks the firing pin and prevents the firing pin from striking a cartridge. In embodiments, the firing pin has two stop portions that the movable member can engage depending on the cycle status of the firearm. A reverse cam mechanism associated with the firing pin blocking provides a resistance to and delays blowback.
F41A 3/46 - Semi-rigid bolt locks, i.e. having locking elements movably mounted on the bolt or on the barrrel or breech housing having sliding locking elements, e.g. balls, rollers mounted on the bolt
F41A 3/12 - Bolt action, i.e. the main breech opening movement being parallel to the barrel axis
F41A 3/70 - Anti-rebound arrangements, i.e. preventing rebound of the bolt out of the firing position
F41A 3/72 - Operating handles or levers; Mounting thereof in breech-blocks or bolts
F41A 19/27 - Mechanical firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins the percussion or firing pin being movable relative to the breech-block
A modular system for adjusting the length of pull and drop of a long gun. The modular system enables a combination of any one of a plurality of comb portions with any one or more of a plurality of butt pad components for a versatile and robust system that provides a wide range of comb height and length of pull combinations. The system can be implemented by the user, avoiding costly gun fitters. The system provides these aspects in a sleek, streamlined way that does not mar the appearance of the long gun. The spacers for the length of pull adjustment include registration surfaces that provide a three-dimensional interface with the buttstock and comb portion for enhanced strength and stability of the assembly over that of conventional fit adjustment systems.
A rimfire takedown firearm that may utilize removable barrels of different calibers. The disclosed firearm does not require a barrel extension, instead providing positioning of the barrel that is sufficiently precise and repeatable. Tensioning of the barrel is provided passively during installation of the removable barrel, without need for adjustment or additional tightening. Securing the removable barrel to the receiver does not structurally involve the fore end, thereby avoiding harmonics effects associated with fore end interfaces to the receiver. The firearm takes advantage of an "underspaced" chamber arrangement to provide additional tolerance for manufacturing and assembly of the firearm.
A semiautomatic handgun has a slide that receives a mounting plate with dovetail slots. The mounting plate having a red dot sight, or other sight mounted thereto, or may be a blank mounting plate such that integrated open iron sights on the handgun may be utilized. The slide has an integrated latch member that is movable between a capture position and a release position. In embodiments, the latch member, as it captures the mounting plate, providing a repeatable left-right centering of the mounting plate with sight thereon by a kinematic coupling. Two dovetail projections on the slide providing repeatable up-down or elevation positioning as the mounting plate with sight thereon is slid onto the slide. In embodiments, the latch member is U-shaped, with two catch portions. The mounting plate has a conventional industry standardized interface on a top side for receiving the red dot sight.
A rifle having a straight pull bolt assembly with a bolt handle that extends outward and downward from a bolt operation mechanism. The bolt handle rotatable a limited rotational range forward and rearwardly about a horizontal axis for operating the mechanism. The handle can be reconfigured to position its rotational range about the horizontal axis and can be attached to the mechanism at either left or right sides to provide for ambidextrous operation. Bolt heads, lower frame members with magazine wells, and barrel assemblies can be readily swapped to change ammunition. The bolt assembly can be unlocked by firing or by a thumb push button release at the backside of the mechanism. A bolt removal release mechanism is forward of the thumb pushbutton and an ejector includes a spring bias and cam follower surface to reliably eject casings.
A semiautomatic shotgun comprising a receiver, a barrel, a forward gas block assembly attached to the barrel, a slider assembly rearward of the gas block assembly extending into the receiver. Upon firing a shotshell the explosive gases in the barrel are diverted through two ports into the gas block assembly, specifically into a pair of lateral pressure relief valves positioned on both sides of the barrel. The pressure relief valves further having a gas pathway from the barrel provided by clusters of holes less than a specific size and on-center with the barrel axis. A piston is forced rearwardly and engages a slider of the slider assembly that is linked to a breech block in the receiver. The breech block loads unfired shells and ejects the fired shells accomplishing the semiautomatic recycling. The dual pressure relief valves actuate to moderate and limit the gas pressure that enters the piston chamber when using shotshells of different power levels thereby providing consistency in the recycling operation. The shotgun assembled with a plurality of retention pins having uniformly sized O-rings.
A semiautomatic shotgun comprising a receiver, a barrel, a forward gas block assembly attached to the barrel, a slider assembly rearward of the gas block assembly extending into the receiver. Upon firing a shotshell the explosive gases in the barrel are diverted through two ports into the gas block assembly, specifically into a pair of lateral pressure relief valves positioned on both sides of the barrel. The pressure relief valves further having a gas pathway to a piston chamber. A piston is forced rearwardly and engages a slider of the slider assembly that is linked to a breech block in the receiver. The breech block loads unfired shells and ejects the fired shells accomplishing the semiautomatic recycling. The dual pressure relief valves actuate to moderate and limit the gas pressure that enters the piston chamber when using shotshells of different power levels thereby providing consistency in the recycling operation.
A trigger assembly having a user-adjustable actuation force. The trigger assembly includes a trigger and indexing pin that are rotatable about a pivot axis and mounted to a locking block of a firearm. A torsion spring bridges the indexing pin and the locking block. Rotation of the indexing pin in a first rotational direction increases the actuation force of the trigger assembly, while rotation of the indexing pin in a second, opposite rotational direction decreases the actuation force. The end user is able to adjust the actuation force of the trigger without procuring additional components and without requiring the services of a locksmith. A safety trigger has a lower pivot point on the trigger and provides a stop that prevents retraction of the trigger unless the safety trigger is retracted first.
A reciprocating bolt assembly has delayed blowback and a firing pin block. Features prevent out-of-battery firing, when the bolt assembly is not fully engaged to the firing chamber or barrel face, a movable member within a bolt body functions as a blocking member that blocks the firing pin and prevents the firing pin from striking a cartridge. In embodiments, the firing pin has two stop portions that the movable member can engage depending on the cycle status of the firearm. A reverse cam mechanism associated with the firing pin blocking provides a resistance to and delays blowback.
F41A 3/46 - Semi-rigid bolt locks, i.e. having locking elements movably mounted on the bolt or on the barrrel or breech housing having sliding locking elements, e.g. balls, rollers mounted on the bolt
F41A 19/27 - Mechanical firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins the percussion or firing pin being movable relative to the breech-block
F41A 3/72 - Operating handles or levers; Mounting thereof in breech-blocks or bolts
F41A 3/70 - Anti-rebound arrangements, i.e. preventing rebound of the bolt out of the firing position
F41A 3/12 - Bolt action, i.e. the main breech opening movement being parallel to the barrel axis
A modular system for adjusting the length of pull and drop of a long gun. The modular system enables a combination of any one of a plurality of comb portions with any one or more of a plurality of butt pad spacers for a versatile and robust system that provides a wide range of comb height and length of pull combinations. The system can be implemented by the user, avoiding costly gun fitters. The system provides these aspects in a sleek, streamlined way that does not mar the appearance of the long gun. The spacers for the length of pull adjustment include registration surfaces that provide a three-dimensional interface with the buttstock and comb portion for enhanced strength and stability of the assembly over that of conventional fit adjustment systems.
A rifle having a straight pull bolt assembly with a bolt handle that extends outward and downward from a bolt operation mechanism. The bolt handle rotatable a limited rotational range forward and rearwardly about a horizontal axis for operating the mechanism. The handle can be reconfigured to position its rotational range about the horizontal axis and can be attached to the mechanism at either left or right sides to provide for ambidextrous operation. Bolt heads, lower frame members with magazine wells, and barrel assemblies can be readily swapped to change ammunition. The bolt assembly can be unlocked by firing or by a thumb push button release at the backside of the mechanism. A bolt removal release mechanism is forward of the thumb pushbutton and an ejector includes a spring bias and cam follower surface to reliably eject casings.
F41A 3/06 - Block action, i.e. the main breech opening movement being transverse to the barrel axis with pivoting breech-block about a horizontal axis transverse to the barrel axis at the rear of the block
F41A 3/12 - Bolt action, i.e. the main breech opening movement being parallel to the barrel axis
F41A 3/20 - Straight-pull operated bolt locks, i.e. the operating hand effecting only a straight movement parallel to the barrel axis
F41A 3/22 - Rigid bolt locks, i.e. having locking elements rigidly mounted on the bolt or bolt handle and on the barrel or breech-housing respectively the locking elements effecting a rotary movement about the barrel axis, e.g. rotating cylinder bolt locks hand-operated the locking being effected by rotating the operating handle or lever transversely to the barrel axis
F41A 3/64 - Mounting of breech-blocks; Accessories for breech-blocks or breech-block mountings
A trigger assembly having a user-adjustable actuation force. The trigger assembly includes a trigger and indexing pin that are rotatable about a pivot axis and mounted to a locking block of a firearm. A torsion spring bridges the indexing pin and the locking block. Rotation of the indexing pin in a first rotational direction increases the actuation force of the trigger assembly, while rotation of the indexing pin in a second, opposite rotational direction decreases the actuation force. The end user is able to adjust the actuation force of the trigger without procuring additional components and without requiring the services of a locksmith. A safety trigger has a lower pivot point on the trigger and provides a stop that prevents retraction of the trigger unless the safety trigger is retracted first.
A trigger assembly having a user-adjustable actuation force. The trigger assembly includes a trigger and indexing pin that are rotatable about a pivot axis and mounted to a locking block of a firearm. A torsion spring bridges the indexing pin and the locking block. Rotation of the indexing pin in a first rotational direction increases the actuation force of the trigger assembly, while rotation of the indexing pin in a second, opposite rotational direction decreases the actuation force. The end user is able to adjust the actuation force of the trigger without procuring additional components and without requiring the services of a locksmith. A safety trigger has a lower pivot point on the trigger and provides a stop that prevents retraction of the trigger unless the safety trigger is retracted first.
F41A 17/72 - Firing-pin safeties, i.e. means for preventing movement of slidably-mounted strikers trigger-operated, i.e. the movement of the trigger bringing a firing-pin safety into inoperative position during the firing
A firearm barrel configured to attach to a muzzle device including a muzzle device bore and a tapered interior surface tapering from a first, wider portion at a proximal end of the muzzle device to a second, narrower portion away from the proximal end. The firearm barrel includes a barrel bore, a first, proximal end, a second, distal end, and a tapered exterior surface tapering from a first, wider portion to a second, narrower portion towards the distal end of the barrel, wherein the tapered exterior surface is configured to operably mate with the tapered interior surface of the muzzle device to optimize axial alignment of the barrel bore with the muzzle device bore.
A semiautomatic shotgun comprising a receiver, a barrel, a forward gas block assembly attached to the barrel, a slider assembly rearward of the gas block assembly extending into the receiver. Upon firing a shotshell the explosive gases in the barrel are diverted through two ports into the gas block assembly, specifically into a pair of lateral pressure relief valves positioned on both sides of the barrel. The pressure relief valves further having a gas pathway to a piston chamber. A piston is forced rearwardly and engages a slider of the slider assembly that is linked to a breech block in the receiver. The breech block loads unfired shells and ejects the fired shells accomplishing the semiautomatic recycling. The dual pressure relief valves actuate to moderate and limit the gas pressure that enters the piston chamber when using shotshells of different power levels thereby providing consistency in the recycling operation.
A modular system for adjusting the length of pull and drop of a long gun. The modular system enables a combination of any one of a plurality of comb portions with any one or more of a plurality of butt pad spacers for a versatile and robust system that provides a wide range of comb height and length of pull combinations. The system can be implemented by the user, avoiding costly gun fitters. The system provides these aspects in a sleek, streamlined way that does not mar the appearance of the long gun. The spacers for the length of pull adjustment include registration surfaces that provide a three-dimensional interface with the buttstock and comb portion for enhanced strength and stability of the assembly over that of conventional fit adjustment systems.
A modular system for adjusting the length of pull and drop of a long gun. The modular system enables a combination of any one of a plurality of comb portions with any one or more of a plurality of butt pad spacers for a versatile and robust system that provides a wide range of comb height and length of pull combinations. The system can be implemented by the user, avoiding costly gun fitters. The system provides these aspects in a sleek, streamlined way that does not mar the appearance of the long gun. The spacers for the length of pull adjustment include registration surfaces that provide a three-dimensional interface with the buttstock and comb portion for enhanced strength and stability of the assembly over that of conventional fit adjustment systems.
06 - Common metals and ores; objects made of metal
19 - Non-metallic building materials
28 - Games; toys; sports equipment
37 - Construction and mining; installation and repair services
Goods & Services
Shooting ranges, namely, shooting ranges comprised primarily of transportable metal ballistic structures; bullet traps, namely, transportable structures comprised of metal for shooting ranges for bullet collection and disposal; modular shooting stalls, namely, transportable modular shooting stalls comprised primarily of metal ballistic partitions for shooting ranges Shoot houses, namely, shoot houses comprised of pre-fabricated, non-metal, non-ballistic, transportable, modular panel structures for tactical firearm training; bullet traps, namely, transportable structures comprised of non-metal panel structures for shooting ranges for bullet collection and disposal; modular, transportable shooting stalls comprised primarily of non-metal partitions for shooting ranges Portable bullet traps; targets; firearm target systems sold as a unit featuring moving shooting targets, target retrievers Construction of modular buildings, namely, shoot houses
34.
Firearm having a tool-less trigger pull adjustment
A firearm with a tool-less adjustable trigger pull. The adjustment may be facilitated with a thumb rotatable wheel for tool-less tension adjustment of a trigger tension spring. The rotatable wheel may be accessed by snapping a trigger guard away from a stock of the firearm. Accordingly, the force required to actuate the trigger can be adjusted to the user's preference without having to remove the trigger assembly from the stock, and without need for external tools or accessories.
F41A 3/22 - Rigid bolt locks, i.e. having locking elements rigidly mounted on the bolt or bolt handle and on the barrel or breech-housing respectively the locking elements effecting a rotary movement about the barrel axis, e.g. rotating cylinder bolt locks hand-operated the locking being effected by rotating the operating handle or lever transversely to the barrel axis
F41A 21/48 - Barrel mounting means, e.g. releasable mountings for replaceable barrels
F41A 19/30 - Mechanical firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins the percussion or firing pin being movable relative to the breech-block propelled by a spring under tension in bolt-action guns
F41A 17/56 - Sear safeties, i.e. means for rendering ineffective an intermediate lever transmitting trigger movement to firing pin, hammer, bolt or sear
F41A 17/52 - Thumb-operated sliding safeties mounted on the upside of the stock, e.g. for shotguns
F41A 17/62 - Thumb-operated sliding safeties mounted on the upside of the stock, e.g. for shotguns
F41A 3/42 - Semi-rigid bolt locks, i.e. having locking elements movably mounted on the bolt or on the barrrel or breech housing having rocking locking elements, e.g. pivoting levers or vanes hand-operated
An improved firearm. The improved firearm includes a barreled action; a stock; and a support located between the barreled action and the stock. In one preferred embodiment, the support includes a center support rail and a pair of side rails located parallel to the center support rail.
An improved firearm. The improved firearm includes a barreled action; a stock; and a support located between the barreled action and the stock. In one preferred embodiment, the support includes a center support rail and a pair of side rails located parallel to the center support rail. In another preferred embodiment of the inventions, the firearm also includes a harmonic tuner assembly for the barrel.
A semiautomatic shotgun comprising a receiver, a barrel, a forward gas block assembly attached to the barrel, a slider assembly rearward of the gas block assembly extending into the receiver. Upon firing a shotshell the explosive gases in the barrel are diverted through two ports into the gas block assembly, specifically into a pair of lateral pressure relief valves positioned on both sides of the barrel. The pressure relief valves further having a gas pathway to a piston chamber. A piston is forced rearwardly and engages a slider of the slider assembly that is linked to a breech block in the receiver. The breech block loads unfired shells and ejects the fired shells accomplishing the semiautomatic recycling. The dual pressure relief valves actuate to moderate and limit the gas pressure that enters the piston chamber when using shotshells of different power levels thereby providing consistency in the recycling operation.
A semiautomatic shotgun comprising a receiver, a barrel, a forward gas block assembly attached to the barrel, a slider assembly rearward of the gas block assembly extending into the receiver. Upon firing a shotshell the explosive gases in the barrel are diverted through two ports into the gas block assembly, specifically into a pair of lateral pressure relief valves positioned on both sides of the barrel. The pressure relief valves further having a gas pathway to a piston chamber. A piston is forced rearwardly and engages a slider of the slider assembly that is linked to a breech block in the receiver. The breech block loads unfired shells and ejects the fired shells accomplishing the semiautomatic recycling. The dual pressure relief valves actuate to moderate and limit the gas pressure that enters the piston chamber when using shotshells of different power levels thereby providing consistency in the recycling operation.
A reciprocating bolt assembly has delayed blowback and a firing pin block. Features prevent out-of-battery firing, when the bolt assembly is not fully engaged to the firing chamber or barrel face, a movable member within a bolt body functions as a blocking member that blocks the firing pin and prevents the firing pin from striking a cartridge. In embodiments, the firing pin has two stop portions that the movable member can engage depending on the cycle status of the firearm. A reverse cam mechanism associated with the firing pin blocking provides a resistance to and delays blowback.
F41A 3/46 - Semi-rigid bolt locks, i.e. having locking elements movably mounted on the bolt or on the barrrel or breech housing having sliding locking elements, e.g. balls, rollers mounted on the bolt
F41A 3/44 - Semi-rigid bolt locks, i.e. having locking elements movably mounted on the bolt or on the barrrel or breech housing having sliding locking elements, e.g. balls, rollers
F41A 19/27 - Mechanical firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins the percussion or firing pin being movable relative to the breech-block
F41A 3/72 - Operating handles or levers; Mounting thereof in breech-blocks or bolts
F41A 3/70 - Anti-rebound arrangements, i.e. preventing rebound of the bolt out of the firing position
F41A 3/12 - Bolt action, i.e. the main breech opening movement being parallel to the barrel axis
An ejector mechanism for a firearm. The ejector mechanism includes a claw-type extractor disposed opposite a ledge portion that includes an inclined face, the inclined facing being oriented to face toward a bolt face to help secure a shell casing to the bolt face during the extraction process. The claw-type extractor and inclined face, while providing positive retention of the shell casing during ejection, also cooperate to enable the shell casing to be dislodged by an ejector.
F41A 15/14 - Cartridge extractors, i.e. devices for pulling cartridges or cartridge cases at least partially out of the cartridge chamber; Cartridge ejectors, i.e. devices for throwing the extracted cartridges or cartridge cases free of the gun for bolt-action guns the ejector being mounted on, or within, the bolt
F41A 19/27 - Mechanical firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins the percussion or firing pin being movable relative to the breech-block
F41A 21/00 - Barrels or gun tubes; Muzzle attachments; Barrel mounting means
F41A 3/46 - Semi-rigid bolt locks, i.e. having locking elements movably mounted on the bolt or on the barrrel or breech housing having sliding locking elements, e.g. balls, rollers mounted on the bolt
F41A 17/46 - Trigger safeties, i.e. means for preventing trigger movement
F41A 19/14 - Hammers, i.e. pivotably-mounted striker elements; Hammer mountings
A semiautomatic firearm with redundant systems for reducing misfirings. A safety trigger is provided that is passively actuated in advance of a firing trigger. The safety trigger maintains redundant safety mechanisms that prevent inadvertent or accidental actuation of the firing trigger. The firing trigger can be configured for actuation with a very low magnitude or “soft” pull without compromising safety. For the disclosed embodiments, the safety trigger assures that the firearm is discharged only upon deliberate actuation of the firing trigger. In one embodiment, a trigger pull adjustment mechanism provides adjustment of the pull of the firing trigger to a desired force required by the operator. The disclosed trigger pull adjustment mechanism reduces the number of components and complexity of the machined parts over conventional trigger pull adjustment mechanisms.
F41A 19/14 - Hammers, i.e. pivotably-mounted striker elements; Hammer mountings
F41A 15/14 - Cartridge extractors, i.e. devices for pulling cartridges or cartridge cases at least partially out of the cartridge chamber; Cartridge ejectors, i.e. devices for throwing the extracted cartridges or cartridge cases free of the gun for bolt-action guns the ejector being mounted on, or within, the bolt
F41A 19/27 - Mechanical firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins the percussion or firing pin being movable relative to the breech-block
F41A 21/00 - Barrels or gun tubes; Muzzle attachments; Barrel mounting means
F41A 3/46 - Semi-rigid bolt locks, i.e. having locking elements movably mounted on the bolt or on the barrrel or breech housing having sliding locking elements, e.g. balls, rollers mounted on the bolt
F41A 17/46 - Trigger safeties, i.e. means for preventing trigger movement
A semiautomatic firearm with a reciprocating bolt assembly has delayed blowback and a firing pin block. The firearm is particularly suitable for firing necked rimfire cartridges with a high level of reliability. Features prevent out-of-battery firing, when the bolt assembly is not fully engaged to the firing chamber or barrel face, a movable member within a bolt body functions as a blocking member that blocks the firing pin and prevents the firing pin from striking a cartridge. In embodiments, the firing pin has two stop portions that the movable member can engage depending on the cycle status of the firearm. A reverse cam mechanism associated with the firing pin blocking provides a resistance to and delays blowback. The bolt may interface with the necked rimfire cartridge using a undercut engagement on the forward end of the bolt. The semiautomatic firearm also may incorporate one or both of a dual trigger arrangement as part of a trigger and firing mechanism.
F41A 15/14 - Cartridge extractors, i.e. devices for pulling cartridges or cartridge cases at least partially out of the cartridge chamber; Cartridge ejectors, i.e. devices for throwing the extracted cartridges or cartridge cases free of the gun for bolt-action guns the ejector being mounted on, or within, the bolt
F41A 19/27 - Mechanical firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins the percussion or firing pin being movable relative to the breech-block
F41A 21/00 - Barrels or gun tubes; Muzzle attachments; Barrel mounting means
F41A 3/46 - Semi-rigid bolt locks, i.e. having locking elements movably mounted on the bolt or on the barrrel or breech housing having sliding locking elements, e.g. balls, rollers mounted on the bolt
F41A 17/46 - Trigger safeties, i.e. means for preventing trigger movement
F41A 19/14 - Hammers, i.e. pivotably-mounted striker elements; Hammer mountings
54.
Firearm having a dual cam, cock on close bolt action
A bolt action firearm that cocks the firing pin upon closing the bolt and includes a cam pin with dual heads for a high velocity rimfire cartridge. In one embodiment, actuating the main spring while closing the bolt, instead of while opening the bolt, more uniformly distributes the physical energy required by the user over the bolt actuation cycle. The dual heads of the cam pin provide symmetric reactive forces with dual cam slots, thereby preventing the cam pin from skewing or canting within the cam slots. A safety system is provided for the trigger mechanism and a robust connecting systems for the stock.
F41A 3/20 - Straight-pull operated bolt locks, i.e. the operating hand effecting only a straight movement parallel to the barrel axis
F41A 3/22 - Rigid bolt locks, i.e. having locking elements rigidly mounted on the bolt or bolt handle and on the barrel or breech-housing respectively the locking elements effecting a rotary movement about the barrel axis, e.g. rotating cylinder bolt locks hand-operated the locking being effected by rotating the operating handle or lever transversely to the barrel axis
F41A 17/52 - Thumb-operated sliding safeties mounted on the upside of the stock, e.g. for shotguns
F41A 17/56 - Sear safeties, i.e. means for rendering ineffective an intermediate lever transmitting trigger movement to firing pin, hammer, bolt or sear
F41A 19/30 - Mechanical firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins the percussion or firing pin being movable relative to the breech-block propelled by a spring under tension in bolt-action guns
F41A 21/48 - Barrel mounting means, e.g. releasable mountings for replaceable barrels
A method is described. The method includes iteratively performing for each position in a result matrix stored in a third register, multiplying a value at a matrix position stored in a first register with a value at a matrix position stored in a second register to obtain a first multiplicative value, where the positions in the first register and the second register are determined by the position in the result matrix and performing an exclusive or (XOR) operation with the first multiplicative value and a value stored at a result matrix position stored in the third register to obtain a result value.
G06F 9/30 - Arrangements for executing machine instructions, e.g. instruction decode
H04L 9/28 - Arrangements for secret or secure communications; Network security protocols using particular encryption algorithm
H04L 9/06 - Arrangements for secret or secure communications; Network security protocols the encryption apparatus using shift registers or memories for blockwise coding, e.g. D.E.S. systems
