- 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 33/035 - Well heads; Setting-up thereof specially adapted for underwater installations
Patent holdings for IPC class E21B 33/035
Total number of patents in this class: 1253
10-year publication summary
115
|
133
|
140
|
123
|
92
|
89
|
98
|
74
|
65
|
19
|
2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
Owner |
All patents
|
This class
|
---|---|---|
Cameron International Corporation | 1305 |
89 |
OneSubsea IP UK Limited | 378 |
78 |
FMC Technologies, Inc. | 603 |
56 |
FMC Kongsberg Subsea AS | 251 |
51 |
Aker Solutions AS | 226 |
42 |
Equinor Energy AS | 475 |
40 |
Schlumberger Technology Corporation | 9690 |
37 |
Halliburton Energy Services, Inc. | 20165 |
37 |
Hydril USA Distribution LLC | 206 |
30 |
Baker Hughes Energy Technology UK Limited | 168 |
20 |
Weatherford Technology Holdings, LLC | 2135 |
19 |
Expro North Sea Limited | 215 |
17 |
National Oilwell Varco, L.P. | 1604 |
17 |
Neodrill AS | 39 |
15 |
Chevron U.S.A. Inc. | 3774 |
14 |
Aker Subsea AS | 130 |
14 |
GE Oil & Gas UK Limited | 170 |
14 |
Trendsetter Vulcan Offshore, Inc. | 42 |
14 |
Statoil Petroleum AS | 555 |
13 |
Transocean Innovation Labs Ltd | 46 |
13 |
Other owners | 623 |