- 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 17/08 - Casing joints
Patent holdings for IPC class E21B 17/08
Total number of patents in this class: 651
10-year publication summary
|
49
|
57
|
42
|
56
|
38
|
51
|
30
|
34
|
25
|
15
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21296 |
48 |
| Schlumberger Technology Corporation | 11893 |
17 |
| IFP Energies Nouvelles | 3110 |
16 |
| National Oilwell Varco, L.P. | 1700 |
16 |
| Grant Prideco, Inc. | 447 |
15 |
| Hydril Company | 87 |
14 |
| Cameron International Corporation | 1368 |
13 |
| Weatherford Technology Holdings, LLC | 2161 |
11 |
| Oil States Industries (UK) Limited | 45 |
10 |
| Vetco Gray Inc. | 137 |
10 |
| Innovex International, Inc | 128 |
10 |
| Schlumberger Canada Limited | 7627 |
9 |
| Baker Hughes Incorporated | 4903 |
9 |
| Nippon Steel Corporation | 6945 |
9 |
| Schlumberger Technology B.v. | 5302 |
8 |
| Oil States Industries, Inc. | 67 |
8 |
| Services Petroliers Schlumberger | 6038 |
8 |
| Vallourec Oil and Gas France | 453 |
8 |
| OneSubsea IP UK Limited | 440 |
7 |
| Hydril USA Distribution LLC | 227 |
6 |
| Other owners | 399 |