- 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 3/02 - Surface drives for rotary drilling
Patent holdings for IPC class E21B 3/02
Total number of patents in this class: 651
10-year publication summary
56
|
70
|
92
|
81
|
71
|
53
|
40
|
44
|
26
|
15
|
2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
Owner |
All patents
|
This class
|
---|---|---|
Weatherford Technology Holdings, LLC | 2135 |
63 |
Schlumberger Technology Corporation | 9690 |
48 |
Nabors Drilling Technologies USA, Inc. | 533 |
47 |
National Oilwell Varco, L.P. | 1604 |
37 |
Itrec B.V. | 477 |
21 |
Halliburton Energy Services, Inc. | 20165 |
16 |
Tesco Corporation | 73 |
11 |
Warrior Rig Technologies Limited | 36 |
11 |
Schlumberger Canada Limited | 6913 |
9 |
Schlumberger Technology B.v. | 4951 |
9 |
The Charles Machine Works, Inc. | 411 |
9 |
Services Petroliers Schlumberger | 5426 |
9 |
Motive Drilling Technologies, Inc. | 89 |
8 |
Caterpillar Global Mining Equipment LLC | 115 |
7 |
Noetic Technologies Inc. | 126 |
7 |
Canrig Drilling Technology Ltd. | 84 |
6 |
Eurodrill GmbH | 25 |
6 |
Frank's International, LLC | 241 |
6 |
Pilot Drilling Control Limited | 12 |
6 |
Sandvik Intellectual Property AB | 1634 |
6 |
Other owners | 309 |