- 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 31/18 - Grappling tools, e.g. tongs or grabs gripping externally, e.g. overshot
Patent holdings for IPC class E21B 31/18
Total number of patents in this class: 169
10-year publication summary
|
8
|
11
|
20
|
12
|
9
|
5
|
19
|
14
|
13
|
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 | 12911 |
23 |
| Aramco Services Company | 3927 |
10 |
| Halliburton Energy Services, Inc. | 20788 |
9 |
| National Oilwell Varco, L.P. | 1661 |
9 |
| Epiroc Canada Inc. | 18 |
6 |
| Boart Longyear Manufacturing and Distribution Inc. | 111 |
6 |
| Baker Hughes Incorporated | 5279 |
5 |
| Schlumberger Technology Corporation | 10652 |
4 |
| Bly IP Inc. | 31 |
4 |
| Baker Hughes Holdings LLC | 3006 |
4 |
| Autentik AS | 6 |
4 |
| Boart Longyear Company | 15 |
4 |
| Schlumberger Canada Limited | 7266 |
3 |
| Schlumberger Technology B.v. | 5160 |
3 |
| Atlas Copco Canada Inc. | 21 |
3 |
| Hunting Titan, Inc. | 245 |
3 |
| Reflex Instruments Asia Pacific Pty Ltd | 86 |
3 |
| Sandvik Intellectual Property AB | 1490 |
3 |
| Services Petroliers Schlumberger | 5771 |
3 |
| Welltec AS | 297 |
3 |
| Other owners | 57 |