- 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 3/025 - Surface drives for rotary drilling with a to-and-fro rotation of the tool
Patent holdings for IPC class E21B 3/025
Total number of patents in this class: 19
10-year publication summary
|
1
|
5
|
1
|
1
|
6
|
5
|
1
|
0
|
0
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| National Oilwell Varco, L.P. | 1661 |
4 |
| Schlumberger Technology Corporation | 10662 |
3 |
| Halliburton Energy Services, Inc. | 20835 |
2 |
| Cameron International Corporation | 1332 |
1 |
| Liebherr-Werk Nenzing GmbH | 92 |
1 |
| Magnetic Variation Services, LLC | 37 |
1 |
| Nabors Drilling Technologies USA, Inc. | 557 |
1 |
| Sandvik Mining and Construction Oy | 819 |
1 |
| Tracto-Technik GmbH & Co. KG | 170 |
1 |
| Ensign Drilling Inc. | 12 |
1 |
| Cameron Technologies Limited | 211 |
1 |
| Xi'an Manyuan Electromechanical Equipment Co., Ltd. | 1 |
1 |
| Beijing Pengfeng Technology Co., Ltd | 1 |
1 |
| Other owners | 0 |