- 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: 1311
10-year publication summary
|
133
|
140
|
123
|
92
|
89
|
98
|
74
|
76
|
64
|
20
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Cameron International Corporation | 1329 |
90 |
| OneSubsea IP UK Limited | 416 |
84 |
| FMC Technologies, Inc. | 600 |
57 |
| FMC Kongsberg Subsea AS | 251 |
53 |
| Equinor Energy AS | 489 |
43 |
| Schlumberger Technology Corporation | 10627 |
42 |
| Aker Solutions AS | 240 |
42 |
| Halliburton Energy Services, Inc. | 20749 |
38 |
| Hydril USA Distribution LLC | 213 |
31 |
| Baker Hughes Energy Technology UK Limited | 206 |
24 |
| Weatherford Technology Holdings, LLC | 2014 |
17 |
| Expro North Sea Limited | 227 |
17 |
| National Oilwell Varco, L.P. | 1646 |
17 |
| Chevron U.S.A. Inc. | 3929 |
16 |
| GE Oil & Gas UK Limited | 160 |
16 |
| Neodrill AS | 40 |
15 |
| Schlumberger Canada Limited | 7235 |
14 |
| Aker Subsea AS | 130 |
14 |
| Trendsetter Vulcan Offshore, Inc. | 55 |
14 |
| Statoil Petroleum AS | 520 |
13 |
| Other owners | 654 |