- 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 3/02 - Surface drives for rotary drilling
Patent holdings for IPC class E21B 3/02
Total number of patents in this class: 689
10-year publication summary
|
70
|
92
|
81
|
71
|
54
|
39
|
44
|
30
|
46
|
17
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Weatherford Technology Holdings, LLC | 2023 |
63 |
| Schlumberger Technology Corporation | 10717 |
51 |
| Nabors Drilling Technologies USA, Inc. | 559 |
48 |
| National Oilwell Varco, L.P. | 1671 |
36 |
| Itrec B.V. | 503 |
23 |
| Halliburton Energy Services, Inc. | 20891 |
17 |
| The Charles Machine Works, Inc. | 405 |
12 |
| Motive Drilling Technologies, Inc. | 103 |
11 |
| Tesco Corporation | 73 |
11 |
| Warrior Rig Technologies Limited | 34 |
11 |
| Vermeer Manufacturing Company | 634 |
10 |
| Schlumberger Canada Limited | 7296 |
9 |
| Schlumberger Technology B.v. | 5168 |
9 |
| Services Petroliers Schlumberger | 5788 |
9 |
| Noetic Technologies Inc. | 123 |
7 |
| Canrig Drilling Technology Ltd. | 68 |
6 |
| Caterpillar Global Mining Equipment LLC | 160 |
6 |
| Eurodrill GmbH | 29 |
6 |
| Frank's International, LLC | 238 |
6 |
| Pason Systems Corp. | 79 |
6 |
| Other owners | 332 |