- 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 12/00 - Accessories for drilling tools
Patent holdings for IPC class E21B 12/00
Total number of patents in this class: 265
10-year publication summary
49
|
37
|
34
|
13
|
19
|
23
|
13
|
16
|
6
|
3
|
2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
Owner |
All patents
|
This class
|
---|---|---|
Halliburton Energy Services, Inc. | 20165 |
62 |
Baker Hughes Incorporated | 5689 |
14 |
Schlumberger Technology Corporation | 9690 |
13 |
Baker Hughes Holdings LLC | 3060 |
11 |
Schlumberger Canada Limited | 6913 |
9 |
Schlumberger Technology B.v. | 4951 |
9 |
Services Petroliers Schlumberger | 5426 |
9 |
Saudi Arabian Oil Company | 11322 |
7 |
Schlumberger Holdings Limited | 2947 |
5 |
China Petroleum & Chemical Corporation | 1623 |
5 |
Prad Research and Development Limited | 2696 |
5 |
Baker Hughes, a GE Company, LLC | 2171 |
5 |
Landmark Graphics Corporation | 1526 |
4 |
Vermeer Manufacturing Company | 615 |
4 |
APS Technology, Inc. | 87 |
3 |
Groupe Fordia Inc. | 21 |
3 |
Nabors Drilling Technologies USA, Inc. | 533 |
3 |
Sinopec Research Institute of Petroleum Engineering | 25 |
3 |
Zhejiang University | 2619 |
3 |
Chester Brown Industries Pty Ltd | 6 |
3 |
Other owners | 85 |