- 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 33/02 - Surface sealing or packing
Patent holdings for IPC class E21B 33/02
Total number of patents in this class: 194
10-year publication summary
|
15
|
12
|
11
|
14
|
8
|
8
|
15
|
6
|
6
|
5
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21305 |
14 |
| Cameron International Corporation | 1370 |
13 |
| Schlumberger Technology Corporation | 11839 |
8 |
| Weatherford Technology Holdings, LLC | 2160 |
6 |
| Saudi Arabian Oil Company | 14275 |
6 |
| Schlumberger Canada Limited | 7609 |
5 |
| Pruitt Tool & Supply Co. | 75 |
5 |
| Schlumberger Technology B.v. | 5295 |
4 |
| Grant Prideco, Inc. | 444 |
4 |
| Services Petroliers Schlumberger | 6028 |
4 |
| Schlumberger Holdings Limited | 2690 |
3 |
| Aramco Services Company | 4194 |
3 |
| ConocoPhillips Company | 1711 |
3 |
| Newpark Mats & Integrated Services LLC | 34 |
3 |
| Oil Lift Technology Inc. | 17 |
3 |
| Prad Research and Development Limited | 2655 |
3 |
| Aker Subsea AS | 126 |
2 |
| Callidus Capital B.V. | 22 |
2 |
| CAR-BER Investments Inc. | 13 |
2 |
| Electrical Subsea & Drilling AS | 44 |
2 |
| Other owners | 99 |