- 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 33/072 - Well headsSetting-up thereof having provision for introducing objects or fluids into, or removing objects from, wells for cable-operated tools
Patent holdings for IPC class E21B 33/072
Total number of patents in this class: 178
10-year publication summary
|
10
|
12
|
12
|
19
|
11
|
6
|
10
|
11
|
10
|
6
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Saudi Arabian Oil Company | 14398 |
12 |
| Schlumberger Technology Corporation | 11981 |
11 |
| Halliburton Energy Services, Inc. | 21296 |
11 |
| Schlumberger Technology B.v. | 5292 |
9 |
| Cameron International Corporation | 1366 |
9 |
| National Oilwell Varco UK Limited | 33 |
9 |
| Schlumberger Canada Limited | 7621 |
7 |
| Services Petroliers Schlumberger | 6029 |
7 |
| Schlumberger Holdings Limited | 2659 |
4 |
| Aramco Services Company | 4190 |
4 |
| FMC Kongsberg Subsea AS | 170 |
4 |
| FMC Technologies, Inc. | 622 |
4 |
| Prad Research and Development Limited | 2641 |
4 |
| Baker Hughes Oilfield Operations, LLC | 2558 |
4 |
| Weatherford Technology Holdings, LLC | 2168 |
3 |
| Petroleo Brasileiro S.A. - Petrobras | 980 |
3 |
| Cameron Technologies Limited | 234 |
3 |
| The Jlar Group, Ltd | 5 |
3 |
| Well-centric Oilfield Services Ltd | 3 |
3 |
| Baker Hughes Incorporated | 4865 |
2 |
| Other owners | 62 |