- 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 25/10 - Formed core retaining or severing means
Patent holdings for IPC class E21B 25/10
Total number of patents in this class: 122
10-year publication summary
|
10
|
8
|
8
|
11
|
18
|
10
|
15
|
3
|
5
|
4
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Shenzhen University | 1639 |
18 |
| Sichuan University | 566 |
13 |
| Halliburton Energy Services, Inc. | 20891 |
12 |
| Baker Hughes Incorporated | 5247 |
7 |
| Veracio Ltd. | 64 |
4 |
| Schlumberger Technology Corporation | 10717 |
3 |
| China Oilfield Services Limited | 87 |
3 |
| Longyear TM, Inc. | 101 |
3 |
| Saudi Arabian Oil Company | 13155 |
3 |
| Specialised Oilfield Services Pty Ltd | 5 |
3 |
| Chevron U.S.A. Inc. | 3955 |
2 |
| Smith International, Inc. | 717 |
2 |
| China University of Geosciences (Wuhan) | 81 |
2 |
| ConocoPhillips Company | 1673 |
2 |
| Coreall AS | 11 |
2 |
| Flexidrill Limited | 46 |
2 |
| National Oilwell Varco, L.P. | 1671 |
2 |
| Baker Hughes Oilfield Operations, LLC | 2301 |
2 |
| Baker Hughes, a GE Company, LLC | 2112 |
2 |
| Baker Hughes Holdings LLC | 3007 |
2 |
| Other owners | 33 |