- 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 21/00 - Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
Patent holdings for IPC class E21B 21/00
Total number of patents in this class: 2056
10-year publication summary
|
201
|
239
|
221
|
173
|
197
|
113
|
93
|
86
|
104
|
35
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Saudi Arabian Oil Company | 14235 |
369 |
| Halliburton Energy Services, Inc. | 21338 |
354 |
| Schlumberger Technology Corporation | 11818 |
111 |
| M-I L.L.C. | 746 |
49 |
| Aramco Services Company | 4195 |
42 |
| Schlumberger Canada Limited | 7606 |
33 |
| Baker Hughes Holdings LLC | 3023 |
33 |
| Baker Hughes Incorporated | 4934 |
31 |
| Weatherford Technology Holdings, LLC | 2155 |
29 |
| Services Petroliers Schlumberger | 6024 |
29 |
| Schlumberger Technology B.v. | 5298 |
26 |
| Grant Prideco, Inc. | 442 |
20 |
| Enhanced Drilling AS | 46 |
18 |
| Schlumberger Holdings Limited | 2699 |
17 |
| Canadian Energy Services LP | 74 |
17 |
| Dorf Ketal Chemicals FZE | 197 |
17 |
| Mako Rentals, Inc. | 44 |
16 |
| Prad Research and Development Limited | 2661 |
16 |
| Baker Hughes, a GE Company, LLC | 2056 |
15 |
| King Fahd University of Petroleum and Minerals | 1572 |
14 |
| Other owners | 800 |