- 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 31/12 - Grappling tools, e.g. tongs or grabs
Patent holdings for IPC class E21B 31/12
Total number of patents in this class: 94
10-year publication summary
|
9
|
10
|
8
|
5
|
4
|
4
|
5
|
11
|
6
|
2
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Saudi Arabian Oil Company | 13409 |
15 |
| Halliburton Energy Services, Inc. | 20964 |
12 |
| Schlumberger Technology Corporation | 10898 |
6 |
| National Oilwell Varco, L.P. | 1689 |
6 |
| Hunting Titan, Inc. | 247 |
4 |
| Weatherford Technology Holdings, LLC | 2028 |
3 |
| Boart Longyear Manufacturing and Distribution Inc. | 110 |
3 |
| Baker Hughes Incorporated | 5246 |
2 |
| Beijing Hailan Science & Technology Development Co., Ltd. | 3 |
2 |
| BP Corporation North America Inc. | 749 |
2 |
| ConocoPhillips Company | 1677 |
2 |
| Baker Hughes Holdings LLC | 2999 |
2 |
| Aes-eot Equipment Holdings, LLC | 30 |
2 |
| NuclearSAFE Technology LLC | 11 |
2 |
| Vangaard Downhole Inc. | 5 |
2 |
| Autentik AS | 6 |
2 |
| Schlumberger Canada Limited | 7369 |
1 |
| Schlumberger Technology B.v. | 5184 |
1 |
| Enventure Global Technology, L.L.C. | 88 |
1 |
| Chevron U.S.A. Inc. | 3996 |
1 |
| Other owners | 23 |