- 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 19/08 - Apparatus for feeding the rods or cablesApparatus for increasing or decreasing the pressure on the drilling toolApparatus for counterbalancing the weight of the rods
Patent holdings for IPC class E21B 19/08
Total number of patents in this class: 552
10-year publication summary
|
41
|
44
|
40
|
37
|
31
|
25
|
9
|
12
|
6
|
0
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Schlumberger Technology Corporation | 11326 |
36 |
| Halliburton Energy Services, Inc. | 21125 |
32 |
| Schlumberger Canada Limited | 7511 |
21 |
| Frank's International, LLC | 238 |
19 |
| Schlumberger Technology B.v. | 5257 |
17 |
| Services Petroliers Schlumberger | 5940 |
17 |
| Nabors Drilling Technologies USA, Inc. | 564 |
14 |
| National Oilwell Varco, L.P. | 1702 |
14 |
| The Charles Machine Works, Inc. | 415 |
12 |
| Premier Coil Solutions, Inc. | 72 |
12 |
| Weatherford Technology Holdings, LLC | 2035 |
10 |
| Baker Hughes Incorporated | 5094 |
9 |
| Joy Global Underground Mining LLC | 348 |
9 |
| Athabasca Oil Corporation | 21 |
8 |
| Itrec B.V. | 505 |
8 |
| Schlumberger Holdings Limited | 2754 |
7 |
| Celtic Machining Ltd. | 11 |
7 |
| Prad Research and Development Limited | 2683 |
7 |
| Cameron International Corporation | 1357 |
6 |
| Key Energy Services, LLC | 43 |
6 |
| Other owners | 281 |