- All sections
- E - Fixed constructions
- E21B - Earth or rock drilling; obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B 19/081 - Screw-and-nut feed mechanisms
Patent holdings for IPC class E21B 19/081
Total number of patents in this class: 16
10-year publication summary
|
3
|
0
|
1
|
1
|
1
|
2
|
0
|
2
|
2
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Ensco Services Limited | 9 |
3 |
| Joy Global Underground Mining LLC | 346 |
2 |
| 1914415 Alberta Ltd. | 4 |
2 |
| The Charles Machine Works, Inc. | 416 |
1 |
| Consolidated Rig Works L.P. | 5 |
1 |
| Flipout Screwdrivers, LLC | 1 |
1 |
| FMC Technologies, Inc. | 586 |
1 |
| Shandong University of Science and Technology | 499 |
1 |
| Tangshan Harbin Ship Technology Co., Ltd. | 204 |
1 |
| Qinghai 906 Engineering Survey and Design Institute Co. LTD | 1 |
1 |
| Qinghai Bureau of Environmental Geology Exploration | 1 |
1 |
| Qinghai Institute of Geological and Environmental Survey | 1 |
1 |
| Other owners | 0 |