- 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 33/122 - Multiple-string packers
Patent holdings for IPC class E21B 33/122
Total number of patents in this class: 230
10-year publication summary
|
7
|
14
|
9
|
12
|
10
|
5
|
7
|
7
|
9
|
14
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21006 |
65 |
| Schlumberger Technology Corporation | 10994 |
22 |
| Baker Hughes Incorporated | 5190 |
20 |
| Schlumberger Canada Limited | 7410 |
16 |
| Schlumberger Technology B.v. | 5210 |
15 |
| Services Petroliers Schlumberger | 5866 |
15 |
| Schlumberger Holdings Limited | 2795 |
6 |
| Bisn Tec Ltd | 80 |
6 |
| Prad Research and Development Limited | 2688 |
6 |
| Saudi Arabian Oil Company | 13569 |
6 |
| Packers Plus Energy Services Inc. | 123 |
3 |
| Baker Hughes, a GE Company, LLC | 2107 |
3 |
| Exacta-Frac Energy Services, Inc. | 55 |
3 |
| Welltec Manufacturing Center Completions ApS | 91 |
3 |
| Weatherford Technology Holdings, LLC | 2029 |
2 |
| China Petroleum & Chemical Corporation | 1939 |
2 |
| M-I L.L.C. | 807 |
2 |
| Quick Connectors, Inc. | 30 |
2 |
| Baker Hughes Oilfield Operations, LLC | 2376 |
2 |
| Tianding Sealing Technology (Beijing)Co., Ltd. | 2 |
2 |
| Other owners | 29 |