- 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: 157
10-year publication summary
|
16
|
11
|
11
|
4
|
3
|
4
|
2
|
5
|
8
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20730 |
29 |
| Baker Hughes Incorporated | 5295 |
10 |
| Tracto-Technik GmbH & Co. KG | 170 |
7 |
| Schlumberger Technology Corporation | 10608 |
6 |
| Center Rock Inc. | 43 |
6 |
| Schlumberger Canada Limited | 7222 |
4 |
| Schlumberger Technology B.v. | 5145 |
4 |
| Schlumberger Holdings Limited | 2844 |
4 |
| Mincon International Limited | 51 |
4 |
| Prad Research and Development Limited | 2695 |
4 |
| Services Petroliers Schlumberger | 5749 |
4 |
| Smith International, Inc. | 722 |
3 |
| China Petroleum & Chemical Corporation | 1867 |
3 |
| Flexidrill Limited | 46 |
3 |
| Sandvik Mining and Construction Oy | 810 |
3 |
| Technological Resources Pty. Limited | 448 |
3 |
| Impact Selector International, LLC | 114 |
2 |
| Sinopec Research Institute of Petroleum Engineering | 26 |
2 |
| Strada Design Limited | 9 |
2 |
| Strada Design Limited | 2 |
2 |
| Other owners | 52 |