- 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: 1073
10-year publication summary
|
109
|
102
|
83
|
77
|
86
|
68
|
45
|
35
|
34
|
21
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Cameron International Corporation | 1367 |
74 |
| OneSubsea IP UK Limited | 433 |
55 |
| FMC Technologies, Inc. | 610 |
39 |
| Halliburton Energy Services, Inc. | 21257 |
36 |
| Schlumberger Technology Corporation | 11584 |
30 |
| Weatherford Technology Holdings, LLC | 2072 |
20 |
| Equinor Energy AS | 495 |
20 |
| Siemens AG | 24132 |
18 |
| National Oilwell Varco, L.P. | 1690 |
16 |
| Trendsetter Engineering, Inc. | 51 |
16 |
| Schlumberger Canada Limited | 7588 |
14 |
| Schlumberger Technology B.v. | 5282 |
14 |
| Hydril USA Distribution LLC | 226 |
14 |
| Vetco Gray Inc. | 141 |
14 |
| Fhe USA LLC | 41 |
14 |
| Baker Hughes Oilfield Operations, LLC | 2480 |
14 |
| Baker Hughes Energy Technology UK Limited | 260 |
14 |
| BP Corporation North America Inc. | 742 |
13 |
| Saudi Arabian Oil Company | 13956 |
13 |
| Services Petroliers Schlumberger | 5996 |
13 |
| Other owners | 612 |