- 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 34/12 - Valve arrangements for boreholes or wells in wells operated by movement of casings or tubings
Patent holdings for IPC class E21B 34/12
Total number of patents in this class: 475
10-year publication summary
|
80
|
31
|
39
|
39
|
30
|
23
|
19
|
15
|
10
|
8
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20769 |
93 |
| Baker Hughes Incorporated | 5281 |
46 |
| Weatherford Technology Holdings, LLC | 2012 |
25 |
| Schlumberger Technology Corporation | 10641 |
17 |
| Baker Hughes Oilfield Operations, LLC | 2273 |
13 |
| Baker Hughes Holdings LLC | 3006 |
12 |
| Baker Hughes, a GE Company, LLC | 2114 |
11 |
| NCS Multistage Inc. | 177 |
10 |
| Saudi Arabian Oil Company | 12891 |
10 |
| Packers Plus Energy Services Inc. | 121 |
9 |
| Thru Tubing Solutions, Inc. | 375 |
9 |
| Schlumberger Canada Limited | 7244 |
8 |
| Schlumberger Technology B.v. | 5154 |
8 |
| Services Petroliers Schlumberger | 5763 |
8 |
| Schlumberger Holdings Limited | 2840 |
6 |
| ExxonMobil Upstream Research Company | 2411 |
6 |
| Prad Research and Development Limited | 2693 |
6 |
| Tejas Research & Engineering, LLC | 26 |
6 |
| Rotojar Innovations Limited | 28 |
5 |
| China Petroleum & Chemical Corporation | 1874 |
4 |
| Other owners | 163 |