- 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 34/02 - Valve arrangements for boreholes or wells in well heads
Patent holdings for IPC class E21B 34/02
Total number of patents in this class: 914
10-year publication summary
|
68
|
91
|
84
|
86
|
86
|
91
|
102
|
88
|
99
|
35
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Cameron International Corporation | 1305 |
119 |
| Saudi Arabian Oil Company | 11322 |
58 |
| Halliburton Energy Services, Inc. | 20165 |
42 |
| Schlumberger Technology Corporation | 9690 |
39 |
| FMC Technologies, Inc. | 603 |
31 |
| Schlumberger Canada Limited | 6913 |
22 |
| Petroleum Technology Company AS | 98 |
20 |
| Vault Pressure Control LLC | 71 |
18 |
| Services Petroliers Schlumberger | 5426 |
17 |
| Cameron Technologies Limited | 229 |
17 |
| Downing Wellhead Equipment, LLC | 42 |
17 |
| Weatherford Technology Holdings, LLC | 2135 |
16 |
| Schlumberger Technology B.v. | 4951 |
15 |
| Gulfstream Services, Inc. | 53 |
15 |
| National Oilwell Varco, L.P. | 1604 |
12 |
| Master Flo Valve Inc. | 43 |
11 |
| Intelligent Wellhead Systems Inc. | 77 |
11 |
| Ice Thermal Harvesting, LLC | 68 |
11 |
| Aramco Services Company | 3504 |
10 |
| OneSubsea IP UK Limited | 378 |
9 |
| Other owners | 404 |