- 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
|
26
|
15
|
12
|
11
|
14
|
8
|
8
|
15
|
5
|
5
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20862 |
17 |
| Cameron International Corporation | 1332 |
13 |
| Schlumberger Technology Corporation | 10673 |
6 |
| Weatherford Technology Holdings, LLC | 2017 |
6 |
| Saudi Arabian Oil Company | 12997 |
6 |
| Schlumberger Canada Limited | 7283 |
5 |
| Pruitt Tool & Supply Co. | 69 |
5 |
| Schlumberger Technology B.v. | 5164 |
4 |
| Grant Prideco, Inc. | 377 |
4 |
| Services Petroliers Schlumberger | 5775 |
4 |
| Schlumberger Holdings Limited | 2834 |
3 |
| Aramco Services Company | 3936 |
3 |
| ConocoPhillips Company | 1676 |
3 |
| Newpark Mats & Integrated Services LLC | 35 |
3 |
| Oil Lift Technology Inc. | 18 |
3 |
| Prad Research and Development Limited | 2693 |
3 |
| Aker Subsea AS | 130 |
2 |
| Anti-Pollution Technology, L.P. | 16 |
2 |
| CAR-BER Investments Inc. | 17 |
2 |
| Dril-Quip, Inc. | 40 |
2 |
| Other owners | 98 |