- 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: 179
10-year publication summary
|
10
|
9
|
9
|
9
|
17
|
9
|
5
|
8
|
11
|
5
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Saudi Arabian Oil Company | 13409 |
12 |
| Schlumberger Technology Corporation | 10898 |
10 |
| Schlumberger Technology B.v. | 5184 |
10 |
| Halliburton Energy Services, Inc. | 20964 |
10 |
| Cameron International Corporation | 1342 |
9 |
| National Oilwell Varco UK Limited | 33 |
9 |
| Schlumberger Canada Limited | 7369 |
8 |
| Services Petroliers Schlumberger | 5830 |
8 |
| Schlumberger Holdings Limited | 2800 |
5 |
| Prad Research and Development Limited | 2691 |
5 |
| Aramco Services Company | 4033 |
4 |
| FMC Kongsberg Subsea AS | 186 |
4 |
| Cameron Technologies Limited | 215 |
4 |
| Weatherford Technology Holdings, LLC | 2028 |
3 |
| Expro North Sea Limited | 232 |
3 |
| FMC Technologies, Inc. | 609 |
3 |
| Petroleo Brasileiro S.A. - Petrobras | 865 |
3 |
| Baker Hughes Oilfield Operations, LLC | 2331 |
3 |
| Altus Intervention (technologies) AS | 66 |
3 |
| Well-centric Oilfield Services Ltd | 3 |
3 |
| Other owners | 60 |