- 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: 1020
10-year publication summary
|
91
|
84
|
86
|
87
|
91
|
102
|
90
|
109
|
98
|
36
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Cameron International Corporation | 1329 |
116 |
| Saudi Arabian Oil Company | 12858 |
73 |
| Schlumberger Technology Corporation | 10627 |
45 |
| Halliburton Energy Services, Inc. | 20749 |
45 |
| FMC Technologies, Inc. | 600 |
38 |
| Schlumberger Canada Limited | 7235 |
27 |
| Downing Wellhead Equipment, LLC | 50 |
21 |
| Petroleum Technology Company AS | 98 |
20 |
| Services Petroliers Schlumberger | 5756 |
20 |
| Schlumberger Technology B.v. | 5148 |
18 |
| Gulfstream Services, Inc. | 58 |
18 |
| Weatherford Technology Holdings, LLC | 2014 |
17 |
| Vault Pressure Control LLC | 69 |
17 |
| Ice Thermal Harvesting, LLC | 76 |
16 |
| Cameron Technologies Limited | 210 |
13 |
| National Oilwell Varco, L.P. | 1646 |
12 |
| Master Flo Valve Inc. | 42 |
11 |
| OneSubsea IP UK Limited | 416 |
11 |
| Intelligent Wellhead Systems Inc. | 82 |
11 |
| Baker Hughes Oilfield Operations, LLC | 2269 |
11 |
| Other owners | 460 |