- 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 33/129 - PackersPlugs with mechanical slips for hooking into the casing
Patent holdings for IPC class E21B 33/129
Total number of patents in this class: 1137
10-year publication summary
|
98
|
80
|
103
|
96
|
89
|
94
|
84
|
68
|
74
|
57
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20977 |
188 |
| Weatherford Technology Holdings, LLC | 2033 |
60 |
| Schlumberger Technology Corporation | 10914 |
56 |
| Baker Hughes Oilfield Operations, LLC | 2334 |
53 |
| The Wellboss Company, LLC | 103 |
52 |
| Baker Hughes, a GE Company, LLC | 2109 |
36 |
| Nine Downhole Technologies, LLC | 72 |
33 |
| Baker Hughes Holdings LLC | 2999 |
33 |
| Schlumberger Canada Limited | 7373 |
31 |
| Baker Hughes Incorporated | 5243 |
31 |
| Schlumberger Technology B.v. | 5189 |
26 |
| Services Petroliers Schlumberger | 5835 |
26 |
| CNPC USA Corp. | 163 |
23 |
| Saudi Arabian Oil Company | 13428 |
23 |
| Innovex Downhole Solutions, LLC | 146 |
21 |
| Vertice Oil Tools Inc. | 94 |
16 |
| China National Petroleum Corporation | 461 |
13 |
| G & H Diversified Manufacturing, LP, Edward Cannoy Kash, U.S. Citizen; Merry Janan Kash, U.S. Citizen | 70 |
12 |
| Beijing Huamei, Inc. | 112 |
12 |
| Exacta-Frac Energy Services, Inc. | 55 |
11 |
| Other owners | 381 |