- 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: 270
10-year publication summary
|
37
|
34
|
13
|
19
|
23
|
13
|
17
|
6
|
9
|
5
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20871 |
64 |
| Baker Hughes Incorporated | 5268 |
14 |
| Schlumberger Technology Corporation | 10691 |
12 |
| Baker Hughes Holdings LLC | 3003 |
11 |
| Schlumberger Canada Limited | 7290 |
9 |
| Schlumberger Technology B.v. | 5166 |
9 |
| Services Petroliers Schlumberger | 5782 |
9 |
| Saudi Arabian Oil Company | 13044 |
8 |
| Schlumberger Holdings Limited | 2833 |
5 |
| China Petroleum & Chemical Corporation | 1894 |
5 |
| Prad Research and Development Limited | 2693 |
5 |
| Baker Hughes, a GE Company, LLC | 2112 |
5 |
| Landmark Graphics Corporation | 1526 |
4 |
| Vermeer Manufacturing Company | 634 |
4 |
| APS Technology, Inc. | 77 |
3 |
| Groupe Fordia Inc. | 22 |
3 |
| Nabors Drilling Technologies USA, Inc. | 558 |
3 |
| Sinopec Research Institute of Petroleum Engineering | 26 |
3 |
| Zhejiang University | 3133 |
3 |
| Chester Brown Industries Pty Ltd | 8 |
3 |
| Other owners | 88 |