- 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 12/00 - Accessories for drilling tools
Patent holdings for IPC class E21B 12/00
Total number of patents in this class: 273
10-year publication summary
|
27
|
11
|
17
|
20
|
12
|
15
|
4
|
8
|
8
|
0
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21098 |
64 |
| Baker Hughes Incorporated | 5109 |
14 |
| Schlumberger Technology Corporation | 11274 |
12 |
| Baker Hughes Holdings LLC | 2986 |
11 |
| Schlumberger Canada Limited | 7487 |
9 |
| Schlumberger Technology B.v. | 5245 |
9 |
| Services Petroliers Schlumberger | 5923 |
9 |
| Saudi Arabian Oil Company | 13857 |
8 |
| Schlumberger Holdings Limited | 2754 |
5 |
| China Petroleum & Chemical Corporation | 1997 |
5 |
| Prad Research and Development Limited | 2684 |
5 |
| Sandvik Mining and Construction Oy | 858 |
5 |
| Baker Hughes, a GE Company, LLC | 2105 |
5 |
| Vermeer Manufacturing Company | 655 |
4 |
| Landmark Graphics Corporation | 1510 |
3 |
| Groupe Fordia Inc. | 23 |
3 |
| Nabors Drilling Technologies USA, Inc. | 565 |
3 |
| Sinopec Research Institute of Petroleum Engineering | 26 |
3 |
| Zhejiang University | 3325 |
3 |
| Chester Brown Industries Pty Ltd | 7 |
3 |
| Other owners | 90 |