- 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 31/20 - Grappling tools, e.g. tongs or grabs gripping internally, e.g. fishing spears
Patent holdings for IPC class E21B 31/20
Total number of patents in this class: 204
10-year publication summary
|
15
|
21
|
24
|
20
|
20
|
14
|
13
|
13
|
11
|
5
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Weatherford Technology Holdings, LLC | 2072 |
24 |
| Saudi Arabian Oil Company | 13956 |
19 |
| Ardyne Holdings Limited | 61 |
19 |
| Halliburton Energy Services, Inc. | 21257 |
8 |
| Welltec AS | 310 |
7 |
| Baker Hughes Holdings LLC | 2986 |
7 |
| Qinterra Technologies AS | 36 |
5 |
| Wellbore Integrity Solutions LLC | 100 |
5 |
| Archer Oiltools AS | 45 |
5 |
| Baker Hughes Oilfield Operations, LLC | 2480 |
4 |
| Epiroc Canada Inc. | 20 |
4 |
| Baker Hughes Incorporated | 5018 |
3 |
| 2M-TEK, Inc. | 9 |
3 |
| Baker Hughes, a GE Company, LLC | 2091 |
3 |
| Vertice Oil Tools Inc. | 96 |
3 |
| Vangaard Downhole Inc. | 5 |
3 |
| Autentik AS | 7 |
3 |
| Tubular Technology Tools LLC | 5 |
3 |
| Boart Longyear Manufacturing and Distribution Incorporation | 9 |
3 |
| Schlumberger Technology Corporation | 11584 |
2 |
| Other owners | 71 |