- 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 19/20 - Combined feeding from rack and connecting, e.g. automatically
Patent holdings for IPC class E21B 19/20
Total number of patents in this class: 351
10-year publication summary
|
22
|
25
|
33
|
26
|
21
|
34
|
21
|
22
|
24
|
6
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Schlumberger Technology Corporation | 11893 |
29 |
| National Oilwell Varco, L.P. | 1700 |
24 |
| Epiroc Rock Drills Aktiebolag | 670 |
12 |
| Nabors Drilling Technologies USA, Inc. | 576 |
11 |
| Schlumberger Canada Limited | 7627 |
10 |
| Schlumberger Technology B.v. | 5302 |
10 |
| Services Petroliers Schlumberger | 6038 |
10 |
| Sandvik Intellectual Property AB | 1389 |
9 |
| Vermeer Manufacturing Company | 676 |
9 |
| Itrec B.V. | 504 |
8 |
| Epiroc Drilling Solutions, LLC | 43 |
8 |
| Helmerich & Payne Technologies, LLC | 115 |
7 |
| CCCC International Holding Limited | 13 |
7 |
| Caterpillar Global Mining Equipment LLC | 181 |
6 |
| Tracto-Technik GmbH & Co. KG | 170 |
6 |
| Epiroc Aktiebolag | 27 |
6 |
| Canrig Robotic Technologies AS | 55 |
6 |
| Gregg Drilling, LLC | 15 |
6 |
| Atlas Copco Rock Drills AB | 122 |
5 |
| LaValley Industries, LLC | 70 |
5 |
| Other owners | 157 |