- 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: 82
10-year publication summary
|
10
|
4
|
3
|
11
|
2
|
6
|
4
|
6
|
3
|
3
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Nouryon Chemicals International B.V. | 647 |
6 |
| Cleantech Building Materials Plc | 6 |
6 |
| Eastman Chemical Company | 2114 |
5 |
| Tricoya Technologies Ltd | 35 |
5 |
| Celanese International Corporation | 912 |
4 |
| Solvay SA | 945 |
4 |
| Mitsubishi Chemical Corporation | 4746 |
3 |
| The University of North Carolina at Chapel Hill | 2120 |
3 |
| BASF SE | 21320 |
2 |
| Shin-Etsu Chemical Co., Ltd. | 6143 |
2 |
| Lanxess Deutschland GmbH | 1148 |
2 |
| Rhodia Operations | 1485 |
2 |
| Solvay Acetow GmbH | 25 |
2 |
| Symrise AG | 1863 |
2 |
| Transitions Optical, Inc. | 232 |
2 |
| Wacker Chemie AG | 2117 |
2 |
| Cerdia International GmbH | 42 |
2 |
| Hyconix, Inc. | 9 |
2 |
| Specialty Operations France | 937 |
2 |
| 3m Innovative Properties Company | 17455 |
1 |
| Other owners | 23 |