- 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 43/27 - Methods for stimulating production by forming crevices or fractures by use of eroding chemicals, e.g. acids
Patent holdings for IPC class E21B 43/27
Total number of patents in this class: 658
10-year publication summary
|
18
|
11
|
16
|
27
|
63
|
40
|
69
|
57
|
60
|
30
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21309 |
104 |
| Saudi Arabian Oil Company | 14305 |
75 |
| Schlumberger Technology Corporation | 11879 |
70 |
| Schlumberger Canada Limited | 7620 |
42 |
| Schlumberger Technology B.v. | 5299 |
39 |
| Services Petroliers Schlumberger | 6033 |
39 |
| Dorf Ketal Chemicals FZE | 196 |
19 |
| Baker Hughes Oilfield Operations, LLC | 2543 |
13 |
| Schlumberger Holdings Limited | 2684 |
12 |
| Chevron U.S.A. Inc. | 4159 |
12 |
| Prad Research and Development Limited | 2652 |
11 |
| Baker Hughes Incorporated | 4905 |
10 |
| ConocoPhillips Company | 1712 |
10 |
| Aramco Services Company | 4192 |
9 |
| Fluid Energy Group Ltd. | 58 |
8 |
| King Fahd University of Petroleum & Minerals | 195 |
7 |
| ExxonMobil Upstream Research Company | 2291 |
6 |
| King Fahd University of Petroleum and Minerals | 1587 |
6 |
| Dorf Ketal Chemicals FZE | 35 |
6 |
| Flex-Chem Holding Company, LLC | 34 |
5 |
| Other owners | 155 |