- 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 4/06 - Down-hole impacting means, e.g. hammers
Patent holdings for IPC class E21B 4/06
Total number of patents in this class: 156
10-year publication summary
|
11
|
11
|
4
|
3
|
4
|
2
|
5
|
9
|
2
|
1
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21284 |
27 |
| Baker Hughes Incorporated | 4897 |
9 |
| Tracto-Technik GmbH & Co. KG | 169 |
7 |
| Schlumberger Technology Corporation | 11924 |
6 |
| Center Rock Inc. | 48 |
6 |
| Schlumberger Canada Limited | 7621 |
4 |
| Schlumberger Technology B.v. | 5299 |
4 |
| Schlumberger Holdings Limited | 2675 |
4 |
| Mincon International Limited | 57 |
4 |
| Prad Research and Development Limited | 2649 |
4 |
| Services Petroliers Schlumberger | 6033 |
4 |
| Smith International, Inc. | 691 |
3 |
| China Petroleum & Chemical Corporation | 2173 |
3 |
| Flexidrill Limited | 39 |
3 |
| Sandvik Mining and Construction Oy | 889 |
3 |
| Technological Resources Pty. Limited | 441 |
3 |
| Caterpillar Inc. | 10302 |
2 |
| Sinopec Research Institute of Petroleum Engineering | 26 |
2 |
| Strada Design Limited | 9 |
2 |
| Strada Design Limited | 2 |
2 |
| Other owners | 54 |