- 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 33/072 - Well heads; Setting-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: 174
10-year publication summary
|
11
|
10
|
12
|
12
|
19
|
11
|
5
|
8
|
10
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Schlumberger Technology B.v. | 5075 |
10 |
| Halliburton Energy Services, Inc. | 20438 |
10 |
| Saudi Arabian Oil Company | 12446 |
10 |
| Schlumberger Canada Limited | 7154 |
9 |
| Cameron International Corporation | 1323 |
9 |
| National Oilwell Varco UK Limited | 35 |
9 |
| Services Petroliers Schlumberger | 5633 |
8 |
| Schlumberger Technology Corporation | 10263 |
7 |
| FMC Kongsberg Subsea AS | 251 |
6 |
| Schlumberger Holdings Limited | 2867 |
5 |
| Prad Research and Development Limited | 2696 |
5 |
| Aramco Services Company | 3750 |
4 |
| Cameron Technologies Limited | 246 |
4 |
| Weatherford Technology Holdings, LLC | 2109 |
3 |
| Expro North Sea Limited | 227 |
3 |
| FMC Technologies, Inc. | 586 |
3 |
| Petroleo Brasileiro S.A. - Petrobras | 782 |
3 |
| Well-centric Oilfield Services Ltd | 3 |
3 |
| Baker Hughes Incorporated | 5504 |
2 |
| Aker Solutions AS | 234 |
2 |
| Other owners | 59 |