- 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 21/16 - Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using gaseous fluids
Patent holdings for IPC class E21B 21/16
Total number of patents in this class: 59
10-year publication summary
7
|
6
|
5
|
7
|
5
|
8
|
9
|
6
|
3
|
2
|
2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
Owner |
All patents
|
This class
|
---|---|---|
Saudi Arabian Oil Company | 11322 |
4 |
Schlumberger Technology Corporation | 9690 |
3 |
Halliburton Energy Services, Inc. | 20165 |
3 |
Sandvik Intellectual Property AB | 1634 |
3 |
Epiroc Rock Drills Aktiebolag | 405 |
3 |
Atlas Copco Drilling Solutions LLC | 17 |
2 |
Bauer Maschinen GmbH | 210 |
2 |
Sandvik Mining and Construction Oy | 703 |
2 |
Southwest Petroleum University | 403 |
2 |
Technological Resources Pty. Limited | 444 |
2 |
Joy Global Surface Mining Inc | 356 |
2 |
Smith International, Inc. | 761 |
1 |
Arizona Board of Regents on behalf of Arizona State University | 2226 |
1 |
Barbco, Inc. | 15 |
1 |
BGP Inc., China National Petroleum Corporation | 50 |
1 |
BP Exploration Operating Company Limited | 270 |
1 |
China Petroleum & Chemical Corporation | 1623 |
1 |
Corbas Marketing, Inc. | 3 |
1 |
Drilling Technology Research Institute of Sinopec Shengli Petroleum Engineering Co., Ltd. | 12 |
1 |
Herrenknecht AG | 186 |
1 |
Other owners | 22 |