- 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 25/14 - Formed core retaining or severing means mounted on pivot transverse to core axis
Patent holdings for IPC class E21B 25/14
Total number of patents in this class: 12
10-year publication summary
|
2
|
0
|
3
|
1
|
1
|
0
|
1
|
0
|
0
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Baker Hughes Incorporated | 5247 |
2 |
| Coreall AS | 11 |
2 |
| Fugro Technology B.V. | 41 |
1 |
| Japan Agency for Marine-Earth Science and Technology | 174 |
1 |
| Longyear TM, Inc. | 101 |
1 |
| National Oilwell Varco, L.P. | 1671 |
1 |
| NSC Co., Ltd. | 54 |
1 |
| PetroChina Company Limited | 708 |
1 |
| Universidade Federal do Rio de Janeiro | 59 |
1 |
| CCC Third Harbor Consultants Co., Ltd. | 1 |
1 |
| Other owners | 0 |