- 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 19/04 - Hooks
Patent holdings for IPC class E21B 19/04
Total number of patents in this class: 25
10-year publication summary
|
1
|
4
|
1
|
1
|
0
|
2
|
1
|
0
|
1
|
3
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Schlumberger Technology Corporation | 10627 |
1 |
| Schlumberger Canada Limited | 7235 |
1 |
| Schlumberger Technology B.v. | 5148 |
1 |
| Halliburton Energy Services, Inc. | 20749 |
1 |
| Shell Internationale Research Maatschappij B.V. | 3544 |
1 |
| Shell Oil Company | 2141 |
1 |
| Weatherford Technology Holdings, LLC | 2014 |
1 |
| BAC Industries, Inc. | 18 |
1 |
| Cameron Sense AS | 3 |
1 |
| China Petroleum & Chemical Corporation | 1869 |
1 |
| Claxton Engineering Services Limited | 12 |
1 |
| Equipment Corporation of America | 6 |
1 |
| Forum US, Inc. | 331 |
1 |
| Frank's International, LLC | 237 |
1 |
| Helix Energy Solutions Group, Inc. | 28 |
1 |
| Mhwirth AS | 129 |
1 |
| National Oilwell Varco, L.P. | 1646 |
1 |
| Pason Systems Corp. | 77 |
1 |
| Research Institute of Petroleum Engineering, Shengli Oil Field, SINOPEC | 3 |
1 |
| Services Petroliers Schlumberger | 5756 |
1 |
| Other owners | 5 |