- 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: 2024
10-year publication summary
|
196
|
201
|
239
|
221
|
173
|
197
|
113
|
92
|
80
|
67
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Saudi Arabian Oil Company | 13044 |
356 |
| Halliburton Energy Services, Inc. | 20871 |
350 |
| Schlumberger Technology Corporation | 10691 |
100 |
| M-I L.L.C. | 812 |
51 |
| Aramco Services Company | 3946 |
40 |
| Baker Hughes Holdings LLC | 3003 |
35 |
| Baker Hughes Incorporated | 5268 |
33 |
| Schlumberger Canada Limited | 7290 |
30 |
| Weatherford Technology Holdings, LLC | 2021 |
30 |
| Services Petroliers Schlumberger | 5782 |
28 |
| Schlumberger Technology B.v. | 5166 |
25 |
| Mako Rentals, Inc. | 60 |
24 |
| Grant Prideco, Inc. | 378 |
20 |
| Schlumberger Holdings Limited | 2833 |
17 |
| Canadian Energy Services LP | 72 |
17 |
| Dorf Ketal Chemicals FZE | 197 |
17 |
| Enhanced Drilling AS | 42 |
16 |
| Prad Research and Development Limited | 2693 |
16 |
| Baker Hughes, a GE Company, LLC | 2112 |
15 |
| Chevron U.S.A. Inc. | 3951 |
12 |
| Other owners | 792 |