- 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 31/14 - Grappling tools, e.g. tongs or grabs with means deflecting the direction of the tool, e.g. by use of knuckle joints
Patent holdings for IPC class E21B 31/14
Total number of patents in this class: 17
10-year publication summary
|
2
|
1
|
1
|
1
|
1
|
3
|
2
|
0
|
0
|
1
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20977 |
6 |
| Baker Hughes Incorporated | 5243 |
3 |
| Saudi Arabian Oil Company | 13428 |
3 |
| Lkab Wassara AB | 22 |
1 |
| NCS Multistage Inc. | 178 |
1 |
| Welltec AS | 300 |
1 |
| MILLS, Aubrey C. | 1 |
1 |
| Baker Hughes Holdings LLC | 2999 |
1 |
| Other owners | 0 |