- 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 33/038 - Connectors used on well heads, e.g. for connecting blow-out preventer and riser
Patent holdings for IPC class E21B 33/038
Total number of patents in this class: 1053
10-year publication summary
|
107
|
109
|
102
|
83
|
77
|
86
|
68
|
45
|
35
|
21
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Cameron International Corporation | 1335 |
74 |
| OneSubsea IP UK Limited | 422 |
56 |
| FMC Technologies, Inc. | 607 |
37 |
| Halliburton Energy Services, Inc. | 20908 |
33 |
| Schlumberger Technology Corporation | 10745 |
28 |
| Weatherford Technology Holdings, LLC | 2024 |
21 |
| Equinor Energy AS | 496 |
20 |
| Siemens AG | 24461 |
19 |
| Aker Solutions AS | 241 |
19 |
| Mako Rentals, Inc. | 60 |
19 |
| National Oilwell Varco, L.P. | 1669 |
16 |
| Trendsetter Engineering, Inc. | 51 |
15 |
| Hydril USA Distribution LLC | 213 |
14 |
| Vetco Gray Inc. | 151 |
14 |
| Baker Hughes Oilfield Operations, LLC | 2313 |
14 |
| Schlumberger Canada Limited | 7298 |
13 |
| Schlumberger Technology B.v. | 5163 |
13 |
| BP Corporation North America Inc. | 744 |
13 |
| Saudi Arabian Oil Company | 13206 |
13 |
| Fhe USA LLC | 41 |
13 |
| Other owners | 589 |