- 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 33/035 - Well headsSetting-up thereof specially adapted for underwater installations
Patent holdings for IPC class E21B 33/035
Total number of patents in this class: 1366
10-year publication summary
|
131
|
115
|
87
|
81
|
88
|
73
|
67
|
58
|
48
|
20
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Cameron International Corporation | 1357 |
90 |
| OneSubsea IP UK Limited | 432 |
85 |
| FMC Technologies, Inc. | 605 |
58 |
| Schlumberger Technology Corporation | 11349 |
47 |
| Equinor Energy AS | 499 |
47 |
| Halliburton Energy Services, Inc. | 21144 |
39 |
| FMC Kongsberg Subsea AS | 186 |
35 |
| Hydril USA Distribution LLC | 215 |
31 |
| TechnipFMC Norge AS | 104 |
31 |
| Aker Solutions AS | 177 |
29 |
| Baker Hughes Energy Technology UK Limited | 231 |
27 |
| Chevron U.S.A. Inc. | 4073 |
22 |
| Schlumberger Canada Limited | 7524 |
17 |
| Expro North Sea Limited | 240 |
17 |
| National Oilwell Varco, L.P. | 1701 |
17 |
| Weatherford Technology Holdings, LLC | 2040 |
16 |
| GE Oil & Gas UK Limited | 158 |
16 |
| Neodrill AS | 40 |
15 |
| OneSubsea AS | 83 |
15 |
| Schlumberger Technology B.v. | 5259 |
14 |
| Other owners | 698 |