- 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 21/00 - 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: 1950
10-year publication summary
|
176
|
196
|
201
|
239
|
221
|
171
|
196
|
111
|
85
|
22
|
| 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 |
339 |
| Halliburton Energy Services, Inc. | 20165 |
333 |
| Schlumberger Technology Corporation | 9690 |
94 |
| M-I L.L.C. | 893 |
56 |
| Aramco Services Company | 3504 |
38 |
| Baker Hughes Incorporated | 5689 |
36 |
| Baker Hughes Holdings LLC | 3060 |
36 |
| Weatherford Technology Holdings, LLC | 2135 |
31 |
| Schlumberger Canada Limited | 6913 |
28 |
| Services Petroliers Schlumberger | 5426 |
26 |
| Schlumberger Technology B.v. | 4951 |
25 |
| Grant Prideco, Inc. | 384 |
22 |
| Mako Rentals, Inc. | 61 |
21 |
| Schlumberger Holdings Limited | 2947 |
18 |
| Canadian Energy Services LP | 67 |
18 |
| Prad Research and Development Limited | 2696 |
16 |
| Baker Hughes, a GE Company, LLC | 2171 |
16 |
| Enhanced Drilling AS | 36 |
12 |
| ExxonMobil Upstream Research Company | 2525 |
11 |
| National Oilwell Varco, L.P. | 1604 |
11 |
| Other owners | 763 |