- 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: 192
10-year publication summary
|
15
|
11
|
9
|
11
|
7
|
6
|
12
|
5
|
3
|
3
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21194 |
14 |
| Cameron International Corporation | 1368 |
13 |
| Schlumberger Technology Corporation | 11483 |
7 |
| Weatherford Technology Holdings, LLC | 2065 |
6 |
| Saudi Arabian Oil Company | 13949 |
6 |
| Schlumberger Canada Limited | 7553 |
5 |
| Pruitt Tool & Supply Co. | 73 |
5 |
| Schlumberger Technology B.v. | 5268 |
4 |
| Grant Prideco, Inc. | 427 |
4 |
| Services Petroliers Schlumberger | 5977 |
4 |
| Schlumberger Holdings Limited | 2737 |
3 |
| Aramco Services Company | 4162 |
3 |
| ConocoPhillips Company | 1701 |
3 |
| Newpark Mats & Integrated Services LLC | 34 |
3 |
| Oil Lift Technology Inc. | 17 |
3 |
| Prad Research and Development Limited | 2679 |
3 |
| Aker Subsea AS | 126 |
2 |
| Callidus Capital B.V. | 21 |
2 |
| CAR-BER Investments Inc. | 15 |
2 |
| Dril-Quip, Inc. | 38 |
2 |
| Other owners | 98 |