- 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 33/047 - Casing headsSuspending casings or tubings in well heads for plural tubing strings
Patent holdings for IPC class E21B 33/047
Total number of patents in this class: 76
10-year publication summary
|
9
|
9
|
4
|
2
|
4
|
3
|
7
|
2
|
6
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Cameron International Corporation | 1332 |
13 |
| OneSubsea IP UK Limited | 419 |
5 |
| Evolution Oil Tools Inc. | 19 |
4 |
| Statoil Petroleum AS | 517 |
4 |
| Weatherford Technology Holdings, LLC | 2017 |
3 |
| Saudi Arabian Oil Company | 12997 |
3 |
| New Bridge Resource Development Fund, LP | 13 |
3 |
| Halliburton Energy Services, Inc. | 20862 |
2 |
| Shell Internationale Research Maatschappij B.V. | 3551 |
2 |
| Shell Oil Company | 2141 |
2 |
| BP Corporation North America Inc. | 745 |
2 |
| FMC Technologies, Inc. | 601 |
2 |
| Weatherford U.K. Limited | 71 |
2 |
| Schlumberger Technology Corporation | 10673 |
1 |
| Schlumberger Canada Limited | 7283 |
1 |
| Schlumberger Technology B.v. | 5164 |
1 |
| Aker Solutions Inc. | 36 |
1 |
| Aker Subsea Limited | 31 |
1 |
| Aramco Services Company | 3936 |
1 |
| BP Exploration Operating Company Limited | 266 |
1 |
| Other owners | 22 |