- 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 29/08 - Cutting or deforming pipes to control fluid flow
Patent holdings for IPC class E21B 29/08
Total number of patents in this class: 214
10-year publication summary
|
17
|
22
|
6
|
10
|
9
|
8
|
4
|
13
|
3
|
2
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20924 |
19 |
| National Oilwell Varco, L.P. | 1683 |
18 |
| Schlumberger Technology Corporation | 10802 |
8 |
| ENI S.p.A. | 1270 |
7 |
| Interventek Subsea Engineering Limited | 18 |
7 |
| Baker Hughes Oilfield Operations, LLC | 2304 |
7 |
| Schlumberger Canada Limited | 7343 |
6 |
| Cameron International Corporation | 1336 |
6 |
| Foro Energy, Inc. | 106 |
6 |
| Schlumberger Technology B.v. | 5182 |
5 |
| Services Petroliers Schlumberger | 5811 |
5 |
| Worldwide Oilfield Machine, Inc. | 51 |
5 |
| Baker Hughes Incorporated | 5265 |
4 |
| Enovate Systems Limited | 52 |
4 |
| Expro North Sea Limited | 231 |
4 |
| Kinetic Pressure Control Limited | 82 |
4 |
| SPEX Group Holdings Limited | 14 |
4 |
| Schlumberger Holdings Limited | 2816 |
3 |
| FMC Technologies, Inc. | 610 |
3 |
| Prad Research and Development Limited | 2693 |
3 |
| Other owners | 86 |