- 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 3/03 - Surface drives for rotary drilling with an intermittent unidirectional rotation of the tool
Patent holdings for IPC class E21B 3/03
Total number of patents in this class: 13
10-year publication summary
|
1
|
3
|
1
|
0
|
3
|
3
|
1
|
0
|
0
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Joy Global Underground Mining LLC | 348 |
5 |
| Weatherford Technology Holdings, LLC | 2022 |
2 |
| National Oilwell Varco, L.P. | 1670 |
2 |
| Bauer Maschinen GmbH | 220 |
1 |
| Terex USA, LLC | 137 |
1 |
| General Downhole Tools, Ltd. | 11 |
1 |
| Xi'an Manyuan Electromechanical Equipment Co., Ltd. | 1 |
1 |
| Other owners | 0 |