- 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: 371
10-year publication summary
|
25
|
32
|
17
|
23
|
26
|
23
|
25
|
8
|
16
|
13
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Sumitomo Chemical Company, Limited | 8968 |
22 |
| Libre Holdings, Inc. | 45 |
22 |
| Shin-Etsu Chemical Co., Ltd. | 6113 |
19 |
| Tokyo Ohka Kogyo Co., Ltd. | 1565 |
9 |
| DuPont Electronic Materials International, LLC | 430 |
9 |
| Kao Corporation | 5078 |
8 |
| JSR Corporation | 2560 |
8 |
| Lion Corporation | 737 |
7 |
| WisTa Laboratories Ltd. | 119 |
5 |
| Zhejiang Nhu Pharmaceutical Co., Ltd. | 16 |
5 |
| Chevron Oronite Company LLC | 594 |
4 |
| Asahi Kasei Kabushiki Kaisha | 2838 |
4 |
| Central Glass Company, Limited | 1295 |
4 |
| FutureFuel Chemical Company | 18 |
4 |
| Qianjiang Yongan Pharmaceutical Co., Ltd | 11 |
4 |
| Rhodia Operations | 1490 |
4 |
| Shionogi & Co., Ltd. | 884 |
4 |
| Stepan Company | 565 |
4 |
| Zhejiang Nhu Company Limited | 194 |
4 |
| Shangyu Nhu Bio-Chem Co., Ltd. | 16 |
4 |
| Other owners | 217 |