- 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 44/10 - Arrangements for automatic stopping when the tool is lifted from the working face
Patent holdings for IPC class E21B 44/10
Total number of patents in this class: 23
10-year publication summary
|
1
|
3
|
4
|
4
|
4
|
3
|
3
|
0
|
1
|
0
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Schlumberger Technology Corporation | 11940 |
8 |
| The Charles Machine Works, Inc. | 420 |
5 |
| Helmerich & Payne Technologies, LLC | 123 |
4 |
| Schlumberger Canada Limited | 7610 |
1 |
| Schlumberger Technology B.v. | 5287 |
1 |
| ExxonMobil Upstream Research Company | 2285 |
1 |
| Mhwirth AS | 132 |
1 |
| Services Petroliers Schlumberger | 6022 |
1 |
| Maersk Drilling A/S | 46 |
1 |
| Other owners | 0 |