- 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: 228
10-year publication summary
|
7
|
14
|
9
|
12
|
10
|
5
|
7
|
7
|
9
|
11
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20911 |
64 |
| Schlumberger Technology Corporation | 10780 |
21 |
| Baker Hughes Incorporated | 5274 |
20 |
| Schlumberger Canada Limited | 7332 |
16 |
| Schlumberger Technology B.v. | 5176 |
15 |
| Services Petroliers Schlumberger | 5803 |
15 |
| Schlumberger Holdings Limited | 2817 |
6 |
| Bisn Tec Ltd | 79 |
6 |
| Prad Research and Development Limited | 2693 |
6 |
| Saudi Arabian Oil Company | 13224 |
5 |
| Packers Plus Energy Services Inc. | 121 |
3 |
| Baker Hughes, a GE Company, LLC | 2110 |
3 |
| Exacta-Frac Energy Services, Inc. | 55 |
3 |
| Welltec Manufacturing Center Completions ApS | 91 |
3 |
| Weatherford Technology Holdings, LLC | 2023 |
2 |
| China Petroleum & Chemical Corporation | 1901 |
2 |
| M-I L.L.C. | 815 |
2 |
| Quick Connectors, Inc. | 30 |
2 |
| Baker Hughes Oilfield Operations, LLC | 2302 |
2 |
| Maersk Olie og Gas AS | 103 |
2 |
| Other owners | 30 |