- 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: 128
10-year publication summary
|
8
|
8
|
11
|
18
|
10
|
15
|
3
|
5
|
8
|
3
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Shenzhen University | 1711 |
18 |
| Sichuan University | 617 |
13 |
| Halliburton Energy Services, Inc. | 21247 |
12 |
| Baker Hughes Incorporated | 5026 |
7 |
| Schlumberger Technology Corporation | 11574 |
4 |
| Veracio Ltd. | 73 |
4 |
| China Oilfield Services Limited | 94 |
3 |
| Longyear TM, Inc. | 98 |
3 |
| Saudi Arabian Oil Company | 13953 |
3 |
| Specialised Oilfield Services Pty Ltd | 5 |
3 |
| Coremax Limited | 6 |
3 |
| Chevron U.S.A. Inc. | 4109 |
2 |
| Smith International, Inc. | 699 |
2 |
| China University of Geosciences (Wuhan) | 97 |
2 |
| ConocoPhillips Company | 1697 |
2 |
| Coreall AS | 11 |
2 |
| Flexidrill Limited | 39 |
2 |
| National Oilwell Varco, L.P. | 1689 |
2 |
| Baker Hughes Oilfield Operations, LLC | 2478 |
2 |
| Baker Hughes, a GE Company, LLC | 2092 |
2 |
| Other owners | 37 |