- 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: 635
10-year publication summary
|
53
|
44
|
48
|
38
|
49
|
34
|
42
|
26
|
28
|
16
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20964 |
47 |
| Schlumberger Technology Corporation | 10898 |
16 |
| IFP Energies Nouvelles | 2959 |
16 |
| National Oilwell Varco, L.P. | 1689 |
16 |
| Cameron International Corporation | 1342 |
13 |
| Hydril Company | 93 |
13 |
| Weatherford Technology Holdings, LLC | 2028 |
12 |
| Grant Prideco, Inc. | 388 |
12 |
| Vetco Gray Inc. | 148 |
11 |
| Oil States Industries (UK) Limited | 47 |
10 |
| Innovex International, Inc | 118 |
10 |
| Baker Hughes Incorporated | 5246 |
9 |
| Nippon Steel Corporation | 6365 |
9 |
| Schlumberger Canada Limited | 7369 |
8 |
| Oil States Industries, Inc. | 65 |
8 |
| Vallourec Oil and Gas France | 454 |
8 |
| Schlumberger Technology B.v. | 5184 |
7 |
| OneSubsea IP UK Limited | 423 |
7 |
| Services Petroliers Schlumberger | 5830 |
7 |
| Hydril USA Distribution LLC | 213 |
6 |
| Other owners | 390 |