- 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 7/12 - Underwater drilling
Patent holdings for IPC class E21B 7/12
Total number of patents in this class: 508
10-year publication summary
|
39
|
37
|
31
|
18
|
11
|
15
|
5
|
8
|
7
|
3
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21090 |
25 |
| Cameron International Corporation | 1353 |
21 |
| OneSubsea IP UK Limited | 424 |
15 |
| Hydril USA Distribution LLC | 214 |
13 |
| Itrec B.V. | 504 |
13 |
| Vetco Gray, LLC | 151 |
12 |
| Chevron U.S.A. Inc. | 4020 |
10 |
| ConocoPhillips Company | 1689 |
10 |
| Noble Drilling A/S | 51 |
10 |
| Schlumberger Technology Corporation | 11075 |
9 |
| Weatherford Technology Holdings, LLC | 2034 |
8 |
| Grant Prideco, Inc. | 399 |
8 |
| Mako Rentals, Inc. | 48 |
8 |
| Schlumberger Canada Limited | 7440 |
7 |
| Schlumberger Technology B.v. | 5224 |
6 |
| Aker Solutions AS | 243 |
6 |
| BP Corporation North America Inc. | 748 |
6 |
| National Oilwell Varco, L.P. | 1701 |
6 |
| Services Petroliers Schlumberger | 5885 |
6 |
| Keppel Offshore & Marine Technology Centre Pte Ltd | 59 |
6 |
| Other owners | 303 |