- 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 27/02 - Dump bailers, i.e. containers for depositing substances, e.g. cement or acids
Patent holdings for IPC class E21B 27/02
Total number of patents in this class: 177
10-year publication summary
|
12
|
6
|
14
|
10
|
25
|
15
|
10
|
2
|
6
|
1
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21144 |
21 |
| Saudi Arabian Oil Company | 13904 |
21 |
| Resman AS | 77 |
15 |
| Bisn Tec Ltd | 81 |
8 |
| Aramco Services Company | 4158 |
7 |
| Equinor Energy AS | 499 |
6 |
| Schlumberger Technology Corporation | 11349 |
5 |
| Metrol Technology Limited | 84 |
5 |
| Thru Tubing Solutions, Inc. | 390 |
5 |
| Schlumberger Canada Limited | 7524 |
4 |
| Schlumberger Technology B.v. | 5259 |
4 |
| Schlumberger Holdings Limited | 2753 |
4 |
| Shell Internationale Research Maatschappij B.V. | 3497 |
4 |
| ExxonMobil Upstream Research Company | 2348 |
4 |
| Prad Research and Development Limited | 2683 |
4 |
| Services Petroliers Schlumberger | 5945 |
4 |
| Welltec AS | 303 |
4 |
| Altus Intervention (technologies) AS | 68 |
4 |
| ENI S.p.A. | 1302 |
3 |
| Qinterra Technologies AS | 36 |
3 |
| Other owners | 42 |