- 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: 1052
10-year publication summary
|
100
|
99
|
94
|
78
|
75
|
80
|
64
|
43
|
32
|
29
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Cameron International Corporation | 1353 |
74 |
| OneSubsea IP UK Limited | 424 |
56 |
| FMC Technologies, Inc. | 609 |
38 |
| Halliburton Energy Services, Inc. | 21078 |
33 |
| Schlumberger Technology Corporation | 11054 |
28 |
| Weatherford Technology Holdings, LLC | 2033 |
20 |
| Aker Solutions AS | 243 |
20 |
| Siemens AG | 24333 |
19 |
| Equinor Energy AS | 505 |
19 |
| National Oilwell Varco, L.P. | 1699 |
16 |
| Trendsetter Engineering, Inc. | 52 |
16 |
| Hydril USA Distribution LLC | 214 |
14 |
| Vetco Gray Inc. | 147 |
14 |
| Baker Hughes Oilfield Operations, LLC | 2390 |
14 |
| Schlumberger Canada Limited | 7432 |
13 |
| Schlumberger Technology B.v. | 5223 |
13 |
| BP Corporation North America Inc. | 748 |
13 |
| Saudi Arabian Oil Company | 13656 |
13 |
| Fhe USA LLC | 40 |
13 |
| Aker Subsea AS | 127 |
12 |
| Other owners | 594 |