- 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: 522
10-year publication summary
|
43
|
42
|
34
|
18
|
15
|
16
|
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. | 20835 |
25 |
| Cameron International Corporation | 1332 |
21 |
| Mako Rentals, Inc. | 60 |
18 |
| OneSubsea IP UK Limited | 419 |
15 |
| Itrec B.V. | 503 |
13 |
| Hydril USA Distribution LLC | 213 |
12 |
| Vetco Gray, LLC | 153 |
12 |
| Chevron U.S.A. Inc. | 3947 |
10 |
| Weatherford Technology Holdings, LLC | 2015 |
10 |
| ConocoPhillips Company | 1677 |
10 |
| Noble Drilling A/S | 49 |
10 |
| Schlumberger Technology Corporation | 10662 |
9 |
| Grant Prideco, Inc. | 376 |
8 |
| Schlumberger Canada Limited | 7273 |
7 |
| Schlumberger Technology B.v. | 5161 |
6 |
| Aker Solutions AS | 240 |
6 |
| BP Corporation North America Inc. | 746 |
6 |
| ExxonMobil Upstream Research Company | 2407 |
6 |
| National Oilwell Varco, L.P. | 1661 |
6 |
| Services Petroliers Schlumberger | 5772 |
6 |
| Other owners | 306 |