- All sections
- E - Fixed constructions
- E21B - Earth or rock drillingobtaining 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: 1121
10-year publication summary
|
84
|
86
|
87
|
91
|
102
|
90
|
111
|
105
|
84
|
43
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Cameron International Corporation | 1368 |
116 |
| Saudi Arabian Oil Company | 14207 |
88 |
| Schlumberger Technology Corporation | 11798 |
53 |
| Halliburton Energy Services, Inc. | 21320 |
49 |
| FMC Technologies, Inc. | 615 |
39 |
| Schlumberger Canada Limited | 7606 |
31 |
| Services Petroliers Schlumberger | 6024 |
23 |
| Schlumberger Technology B.v. | 5298 |
21 |
| Downing Wellhead Equipment, LLC | 52 |
21 |
| Petroleum Technology Company AS | 95 |
20 |
| Weatherford Technology Holdings, LLC | 2154 |
19 |
| Intelligent Wellhead Systems Inc. | 77 |
19 |
| Gulfstream Services, Inc. | 58 |
18 |
| Vault Pressure Control LLC | 71 |
17 |
| Ice Thermal Harvesting, LLC | 77 |
16 |
| OneSubsea IP UK Limited | 437 |
14 |
| Cameron Technologies Limited | 230 |
13 |
| Aramco Services Company | 4188 |
12 |
| Cactus Wellhead, LLC | 48 |
12 |
| National Oilwell Varco, L.P. | 1698 |
12 |
| Other owners | 508 |