- 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 19/087 - Apparatus for feeding the rods or cablesApparatus for increasing or decreasing the pressure on the drilling toolApparatus for counterbalancing the weight of the rods by means of a swinging arm
Patent holdings for IPC class E21B 19/087
Total number of patents in this class: 75
10-year publication summary
|
7
|
7
|
5
|
16
|
8
|
5
|
6
|
7
|
8
|
3
|
| 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. | 1646 |
8 |
| Schlumberger Technology Corporation | 10627 |
4 |
| Nabors Lux 2 SARL | 21 |
4 |
| Canrig Robotic Technologies AS | 54 |
4 |
| Weatherford Technology Holdings, LLC | 2014 |
3 |
| LaValley Industries, LLC | 68 |
3 |
| Mhwirth AS | 129 |
3 |
| Gustomsc B.V. | 29 |
3 |
| Frank's International, LLC | 237 |
2 |
| Nabors Drilling Technologies USA, Inc. | 555 |
2 |
| Sandvik Intellectual Property AB | 1495 |
2 |
| Sandvik Mining and Construction Oy | 811 |
2 |
| Epiroc Rock Drills Aktiebolag | 504 |
2 |
| Safedrill SpA | 7 |
2 |
| British Telecommunications Public Limited Company | 2608 |
1 |
| Atlas Copco Rock Drills AB | 147 |
1 |
| Auger Torque Europe Limited | 15 |
1 |
| Automated Rig Technologies Ltd. | 13 |
1 |
| Bly IP Inc. | 31 |
1 |
| Bouygues Travaux Publics | 28 |
1 |
| Other owners | 25 |