- All sections
- E - Fixed constructions
- E21B - Earth or rock drilling; obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B 21/12 - Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using drilling pipes with plural fluid passages, e.g. closed circulation systems
Patent holdings for IPC class E21B 21/12
Total number of patents in this class: 245
10-year publication summary
|
29
|
11
|
11
|
15
|
17
|
24
|
25
|
10
|
15
|
2
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20165 |
29 |
| Reelwell AS | 67 |
27 |
| Black Diamond Oilfield Rentals LLC | 81 |
10 |
| Schlumberger Technology Corporation | 9690 |
6 |
| Saudi Arabian Oil Company | 11322 |
5 |
| Strada Design Limited | 9 |
5 |
| Baker Hughes Incorporated | 5689 |
4 |
| Spoked Solutions LLC | 20 |
4 |
| Vermeer Manufacturing Company | 615 |
4 |
| Optionx Holdings Pty Ltd | 8 |
4 |
| Weatherford Technology Holdings, LLC | 2135 |
3 |
| ConocoPhillips Company | 1657 |
3 |
| Flexidrill Limited | 53 |
3 |
| Mincon International Limited | 52 |
3 |
| Numa Tool Company | 11 |
3 |
| Wellbore Energy Solutions, LLC | 7 |
3 |
| Epiroc Drilling Tools Aktiebolag | 89 |
3 |
| Rig Technologies International Pty Ltd | 15 |
3 |
| Schlumberger Canada Limited | 6913 |
2 |
| Schlumberger Technology B.v. | 4951 |
2 |
| Other owners | 119 |