- 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 3/035 - Surface drives for rotary drilling with slipping or elastic transmission
Patent holdings for IPC class E21B 3/035
Total number of patents in this class: 26
10-year publication summary
|
4
|
4
|
3
|
1
|
2
|
6
|
1
|
3
|
1
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Nabors Drilling Technologies USA, Inc. | 558 |
5 |
| China Petroleum & Chemical Corporation | 1881 |
4 |
| Halliburton Energy Services, Inc. | 20788 |
3 |
| Sinopec Research Institute of Petroleum Engineering | 26 |
2 |
| General Downhole Tools, Ltd. | 11 |
2 |
| Sinopec Petroleum Engineering Technology Research Institute Co., Ltd. | 40 |
2 |
| Revolink, LLC | 2 |
2 |
| Schlumberger Technology Corporation | 10652 |
1 |
| McCoy Global Inc. | 49 |
1 |
| Noetic Technologies Inc. | 121 |
1 |
| Qinterra Technologies AS | 38 |
1 |
| Tesco Corporation | 73 |
1 |
| MidCap Funding IV Trust | 11 |
1 |
| Other owners | 0 |