- All sections
- C - Chemistrymetallurgy
- C07C - Acyclic or carbocyclic compounds
- C07C 303/32 - Preparation of esters or amides of sulfuric acidsPreparation 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: 351
10-year publication summary
|
32
|
24
|
32
|
17
|
21
|
26
|
21
|
24
|
7
|
11
|
| 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 | 9047 |
22 |
| Shin-Etsu Chemical Co., Ltd. | 5685 |
18 |
| Tokyo Ohka Kogyo Co., Ltd. | 1549 |
9 |
| DuPont Electronic Materials International, LLC | 429 |
9 |
| Kao Corporation | 4979 |
8 |
| Lion Corporation | 740 |
8 |
| JSR Corporation | 2525 |
7 |
| Rhodia Operations | 1587 |
5 |
| Chevron Oronite Company LLC | 573 |
4 |
| Asahi Kasei Kabushiki Kaisha | 2684 |
4 |
| Central Glass Company, Limited | 1271 |
4 |
| FutureFuel Chemical Company | 17 |
4 |
| Qianjiang Yongan Pharmaceutical Co., Ltd | 11 |
4 |
| Shionogi & Co., Ltd. | 849 |
4 |
| Stepan Company | 581 |
4 |
| WisTa Laboratories Ltd. | 136 |
4 |
| Shangyu Nhu Bio-Chem Co., Ltd. | 16 |
4 |
| Zhejiang Nhu Pharmaceutical Co., Ltd. | 14 |
4 |
| BASF SE | 20979 |
3 |
| Other owners | 199 |