- 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 4/16 - Plural down-hole drives, e.g. for combined percussion and rotary drillingDrives for multi-bit drilling units
Patent holdings for IPC class E21B 4/16
Total number of patents in this class: 136
10-year publication summary
|
9
|
8
|
8
|
8
|
17
|
8
|
11
|
9
|
3
|
3
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21320 |
12 |
| China Petroleum & Chemical Corporation | 2147 |
10 |
| Flexidrill Limited | 39 |
6 |
| Lkab Wassara AB | 22 |
6 |
| Sinopec Petroleum Engineering Technology Research Institute Co., Ltd. | 56 |
6 |
| Saudi Arabian Oil Company | 14207 |
4 |
| Sinopec Research Institute of Petroleum Engineering | 26 |
4 |
| Schlumberger Technology Corporation | 11798 |
3 |
| Fishbones AS | 9 |
3 |
| Thru Tubing Solutions, Inc. | 404 |
3 |
| EarthGrid PBC | 26 |
3 |
| Schlumberger Canada Limited | 7606 |
2 |
| Schlumberger Technology B.v. | 5298 |
2 |
| Schlumberger Holdings Limited | 2702 |
2 |
| ConocoPhillips Company | 1708 |
2 |
| Lewal Drilling Ltd. | 3 |
2 |
| Mincon International Limited | 57 |
2 |
| Prad Research and Development Limited | 2662 |
2 |
| Services Petroliers Schlumberger | 6024 |
2 |
| SJM Designs Pty Ltd. | 3 |
2 |
| Other owners | 58 |