- 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 31/20 - 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: 183
10-year publication summary
|
17
|
12
|
15
|
21
|
24
|
20
|
20
|
14
|
13
|
3
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Ardyne Holdings Limited | 86 |
27 |
| Saudi Arabian Oil Company | 11322 |
14 |
| Weatherford Technology Holdings, LLC | 2135 |
11 |
| Halliburton Energy Services, Inc. | 20165 |
8 |
| Baker Hughes Holdings LLC | 3060 |
7 |
| Qinterra Technologies AS | 38 |
6 |
| Wellbore Integrity Solutions LLC | 68 |
5 |
| Baker Hughes Incorporated | 5689 |
4 |
| TIW Corporation | 50 |
4 |
| Welltec AS | 301 |
4 |
| Baker Hughes Oilfield Operations, LLC | 1885 |
4 |
| Boart Longyear Company | 262 |
4 |
| Archer Oiltools AS | 26 |
4 |
| 2M-TEK, Inc. | 9 |
3 |
| Baker Hughes, a GE Company, LLC | 2171 |
3 |
| Vertice Oil Tools Inc. | 87 |
3 |
| Vangaard Downhole Inc. | 3 |
3 |
| Schlumberger Technology Corporation | 9690 |
2 |
| Bly IP Inc. | 35 |
2 |
| Geoservices Equipements | 64 |
2 |
| Other owners | 63 |