- 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: 234
10-year publication summary
|
7
|
14
|
9
|
12
|
10
|
5
|
7
|
7
|
9
|
15
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21090 |
65 |
| Schlumberger Technology Corporation | 11075 |
23 |
| Baker Hughes Incorporated | 5172 |
20 |
| Schlumberger Canada Limited | 7440 |
17 |
| Schlumberger Technology B.v. | 5224 |
16 |
| Services Petroliers Schlumberger | 5885 |
16 |
| Schlumberger Holdings Limited | 2784 |
6 |
| Bisn Tec Ltd | 81 |
6 |
| Prad Research and Development Limited | 2687 |
6 |
| Saudi Arabian Oil Company | 13686 |
6 |
| Packers Plus Energy Services Inc. | 123 |
3 |
| Baker Hughes, a GE Company, LLC | 2105 |
3 |
| Exacta-Frac Energy Services, Inc. | 55 |
3 |
| Welltec Manufacturing Center Completions ApS | 94 |
3 |
| Weatherford Technology Holdings, LLC | 2034 |
2 |
| China Petroleum & Chemical Corporation | 1955 |
2 |
| M-I L.L.C. | 806 |
2 |
| Quick Connectors, Inc. | 28 |
2 |
| Baker Hughes Oilfield Operations, LLC | 2393 |
2 |
| Tianding Sealing Technology (Beijing)Co., Ltd. | 2 |
2 |
| Other owners | 29 |