- 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 7/28 - Enlarging drilled holes, e.g. by counterboring
Patent holdings for IPC class E21B 7/28
Total number of patents in this class: 424
10-year publication summary
|
51
|
33
|
43
|
41
|
28
|
24
|
24
|
16
|
9
|
4
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Baker Hughes Incorporated | 5299 |
34 |
| Schlumberger Technology Corporation | 10597 |
26 |
| Halliburton Energy Services, Inc. | 20697 |
24 |
| Smith International, Inc. | 722 |
18 |
| Schlumberger Canada Limited | 7211 |
15 |
| Schlumberger Technology B.v. | 5141 |
15 |
| Services Petroliers Schlumberger | 5743 |
15 |
| Herrenknecht AG | 199 |
14 |
| Saudi Arabian Oil Company | 12808 |
11 |
| Weatherford Technology Holdings, LLC | 2010 |
9 |
| Extreme Technologies, LLC | 27 |
9 |
| Quanta Associates, L.P. | 428 |
9 |
| The Charles Machine Works, Inc. | 409 |
8 |
| Master Sinkers (Pty) Ltd | 7 |
7 |
| Baker Hughes Holdings LLC | 3011 |
7 |
| Southeast Directional Drilling, LLC | 12 |
6 |
| Precise Drilling Components Ltd. | 8 |
6 |
| Baker Hughes, a GE Company, LLC | 2114 |
6 |
| Schlumberger Holdings Limited | 2846 |
5 |
| Frank's International, LLC | 237 |
5 |
| Other owners | 175 |