- 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 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: 590
10-year publication summary
|
26
|
18
|
11
|
16
|
27
|
63
|
40
|
69
|
54
|
1
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20403 |
106 |
| Saudi Arabian Oil Company | 12390 |
60 |
| Schlumberger Technology Corporation | 10217 |
52 |
| Schlumberger Canada Limited | 7137 |
37 |
| Schlumberger Technology B.v. | 5058 |
34 |
| Services Petroliers Schlumberger | 5616 |
34 |
| Dorf Ketal Chemicals FZE | 240 |
22 |
| Schlumberger Holdings Limited | 2870 |
13 |
| Baker Hughes Incorporated | 5514 |
12 |
| Prad Research and Development Limited | 2696 |
11 |
| Chevron U.S.A. Inc. | 3844 |
10 |
| Aramco Services Company | 3735 |
10 |
| ConocoPhillips Company | 1676 |
10 |
| Baker Hughes Oilfield Operations, LLC | 2105 |
10 |
| Fluid Energy Group Ltd. | 68 |
7 |
| ExxonMobil Upstream Research Company | 2456 |
6 |
| King Fahd University of Petroleum & Minerals | 159 |
6 |
| Baker Hughes Holdings LLC | 3013 |
6 |
| Nouryon Chemicals International B.V. | 599 |
5 |
| Flex-Chem Holding Company, LLC | 32 |
4 |
| Other owners | 135 |