- All sections
- C - Chemistry; metallurgy
- C07C - Acyclic or carbocyclic compounds
- C07C 303/32 - Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides of salts of sulfonic acids
Patent holdings for IPC class C07C 303/32
Total number of patents in this class: 344
10-year publication summary
|
33
|
25
|
32
|
17
|
22
|
26
|
23
|
23
|
7
|
1
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Vitaworks IP, LLC | 55 |
23 |
| Sumitomo Chemical Company, Limited | 8976 |
22 |
| Shin-Etsu Chemical Co., Ltd. | 5439 |
18 |
| Lion Corporation | 744 |
8 |
| Tokyo Ohka Kogyo Co., Ltd. | 1509 |
8 |
| DuPont Electronic Materials International, LLC | 365 |
8 |
| Kao Corporation | 4903 |
7 |
| JSR Corporation | 2475 |
7 |
| Rhodia Operations | 1588 |
5 |
| Chevron Oronite Company LLC | 560 |
4 |
| Asahi Kasei Kabushiki Kaisha | 2560 |
4 |
| Central Glass Company, Limited | 1245 |
4 |
| China Petroleum & Chemical Corporation | 1774 |
4 |
| FutureFuel Chemical Company | 17 |
4 |
| Qianjiang Yongan Pharmaceutical Co., Ltd | 10 |
4 |
| Shionogi & Co., Ltd. | 889 |
4 |
| Stepan Company | 573 |
4 |
| WisTa Laboratories Ltd. | 125 |
4 |
| Shangyu Nhu Bio-Chem Co., Ltd. | 16 |
4 |
| Zhejiang Nhu Pharmaceutical Co., Ltd. | 14 |
4 |
| Other owners | 194 |