- All sections
- E - Fixed constructions
- E21B - Earth or rock drilling; obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B 31/12 - Grappling tools, e.g. tongs or grabs
Patent holdings for IPC class E21B 31/12
Total number of patents in this class: 93
10-year publication summary
|
9
|
11
|
12
|
6
|
4
|
6
|
5
|
11
|
6
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Saudi Arabian Oil Company | 12390 |
13 |
| Halliburton Energy Services, Inc. | 20403 |
12 |
| Schlumberger Technology Corporation | 10217 |
6 |
| National Oilwell Varco, L.P. | 1624 |
6 |
| Hunting Titan, Inc. | 244 |
4 |
| Baker Hughes Incorporated | 5514 |
3 |
| Weatherford Technology Holdings, LLC | 2107 |
3 |
| Boart Longyear Company | 269 |
3 |
| Beijing Hailan Science & Technology Development Co., Ltd. | 3 |
2 |
| BP Corporation North America Inc. | 762 |
2 |
| ConocoPhillips Company | 1676 |
2 |
| Ardyne Holdings Limited | 88 |
2 |
| Baker Hughes Holdings LLC | 3013 |
2 |
| Aes-eot Equipment Holdings, LLC | 30 |
2 |
| NuclearSAFE Technology LLC | 11 |
2 |
| Vangaard Downhole Inc. | 4 |
2 |
| Autentik AS | 6 |
2 |
| Schlumberger Canada Limited | 7137 |
1 |
| Schlumberger Technology B.v. | 5058 |
1 |
| Enventure Global Technology, L.L.C. | 100 |
1 |
| Other owners | 22 |