- All sections
- E - Fixed constructions
- E21B - Earth or rock drilling; obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B 33/06 - Blow-out preventers
Patent holdings for IPC class E21B 33/06
Total number of patents in this class: 1472
10-year publication summary
134
|
176
|
172
|
144
|
148
|
101
|
89
|
89
|
70
|
26
|
2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
Owner |
All patents
|
This class
|
---|---|---|
Cameron International Corporation | 1305 |
126 |
National Oilwell Varco, L.P. | 1604 |
108 |
Schlumberger Technology Corporation | 9690 |
105 |
Hydril USA Distribution LLC | 206 |
75 |
Schlumberger Canada Limited | 6913 |
51 |
Halliburton Energy Services, Inc. | 20165 |
43 |
Services Petroliers Schlumberger | 5426 |
43 |
Schlumberger Technology B.v. | 4951 |
42 |
Kinetic Pressure Control Limited | 66 |
35 |
Saudi Arabian Oil Company | 11322 |
33 |
Weatherford Technology Holdings, LLC | 2135 |
28 |
Grant Prideco, Inc. | 384 |
20 |
Nabors Drilling Technologies USA, Inc. | 533 |
20 |
Worldwide Oilfield Machine, Inc. | 50 |
20 |
Baker Hughes Oilfield Operations, LLC | 1885 |
20 |
Electrical Subsea & Drilling AS | 41 |
19 |
Enovate Systems Limited | 57 |
19 |
Hydril USA Manufacturing LLC | 39 |
18 |
Mako Rentals, Inc. | 61 |
18 |
Cameron Technologies Limited | 229 |
18 |
Other owners | 611 |