- 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 17/18 - Pipes provided with plural fluid passages
Patent holdings for IPC class E21B 17/18
Total number of patents in this class: 531
10-year publication summary
|
45
|
33
|
31
|
29
|
35
|
50
|
25
|
25
|
17
|
9
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21019 |
112 |
| Saudi Arabian Oil Company | 13540 |
25 |
| Schlumberger Technology Corporation | 10976 |
24 |
| Baker Hughes Incorporated | 5230 |
16 |
| Vermeer Manufacturing Company | 644 |
14 |
| Weatherford Technology Holdings, LLC | 2034 |
12 |
| Reelwell AS | 68 |
11 |
| Baker Hughes, a GE Company, LLC | 2107 |
11 |
| The Charles Machine Works, Inc. | 407 |
10 |
| Baker Hughes Oilfield Operations, LLC | 2368 |
10 |
| Schlumberger Canada Limited | 7408 |
7 |
| Aramco Services Company | 4068 |
7 |
| FMC Technologies, Inc. | 613 |
7 |
| Rig Technologies International Pty Ltd | 15 |
7 |
| Schlumberger Technology B.v. | 5206 |
6 |
| Services Petroliers Schlumberger | 5857 |
6 |
| Ior Canada Ltd. | 15 |
5 |
| Schlumberger Holdings Limited | 2795 |
4 |
| ExxonMobil Upstream Research Company | 2384 |
4 |
| Flexidrill Limited | 46 |
4 |
| Other owners | 229 |