- All sections
- C - Chemistrymetallurgy
- C07C - Acyclic or carbocyclic compounds
- C07C 51/56 - Preparation of carboxylic acid anhydrides from organic acids, their salts, or their esters
Patent holdings for IPC class C07C 51/56
Total number of patents in this class: 78
10-year publication summary
|
6
|
10
|
4
|
3
|
11
|
2
|
6
|
4
|
6
|
1
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Eastman Chemical Company | 2218 |
6 |
| Nouryon Chemicals International B.V. | 609 |
6 |
| Tricoya Technologies Ltd | 40 |
5 |
| Celanese International Corporation | 908 |
4 |
| Solvay SA | 993 |
4 |
| Mitsubishi Chemical Corporation | 4514 |
3 |
| The University of North Carolina at Chapel Hill | 2039 |
3 |
| Cleantech Building Materials Plc | 3 |
3 |
| Hyconix, Inc. | 10 |
3 |
| BASF SE | 20915 |
2 |
| Shin-Etsu Chemical Co., Ltd. | 5662 |
2 |
| Lanxess Deutschland GmbH | 1117 |
2 |
| Rhodia Operations | 1586 |
2 |
| Solvay Acetow GmbH | 27 |
2 |
| Symrise AG | 1725 |
2 |
| Transitions Optical, Inc. | 255 |
2 |
| Wacker Chemie AG | 2106 |
2 |
| Cerdia International GmbH | 40 |
2 |
| Specialty Operations France | 797 |
2 |
| 3m Innovative Properties Company | 17819 |
1 |
| Other owners | 20 |