- 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 33/043 - Casing headsSuspending casings or tubings in well heads specially adapted for underwater well heads
Patent holdings for IPC class E21B 33/043
Total number of patents in this class: 323
10-year publication summary
|
28
|
27
|
23
|
23
|
20
|
15
|
21
|
28
|
13
|
12
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Innovex International, Inc | 125 |
30 |
| Cameron International Corporation | 1332 |
28 |
| FMC Technologies, Inc. | 602 |
28 |
| OneSubsea IP UK Limited | 419 |
28 |
| Aker Solutions AS | 240 |
21 |
| Halliburton Energy Services, Inc. | 20879 |
11 |
| Baker Hughes Oilfield Operations, LLC | 2297 |
11 |
| Equinor Energy AS | 492 |
10 |
| Baker Hughes Energy Technology UK Limited | 211 |
9 |
| Vetco Gray Inc. | 151 |
8 |
| Neodrill AS | 40 |
6 |
| Plexus Holdings plc | 35 |
6 |
| Aker Subsea Limited | 31 |
5 |
| Vetco Gray, LLC | 152 |
5 |
| CCB Subsea AS | 8 |
5 |
| Chevron U.S.A. Inc. | 3953 |
4 |
| Enovate Systems Limited | 52 |
4 |
| GE Oil & Gas UK Limited | 160 |
4 |
| Vetco Gray Scandinavia AS | 172 |
4 |
| Schlumberger Technology Corporation | 10705 |
3 |
| Other owners | 93 |