- All sections
- C - Chemistry; metallurgy
- 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: 75
10-year publication summary
|
5
|
6
|
10
|
4
|
3
|
11
|
2
|
5
|
4
|
1
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Celanese International Corporation | 879 |
6 |
| Eastman Chemical Company | 2239 |
5 |
| Tricoya Technologies Ltd | 41 |
5 |
| Nouryon Chemicals International B.V. | 508 |
5 |
| Hyconix, Inc. | 12 |
5 |
| Solvay SA | 1181 |
4 |
| Mitsubishi Chemical Corporation | 4313 |
3 |
| Lanxess Deutschland GmbH | 1104 |
3 |
| Shin-Etsu Chemical Co., Ltd. | 5132 |
2 |
| Arkema France | 3790 |
2 |
| Rhodia Operations | 1645 |
2 |
| Solvay Acetow GmbH | 29 |
2 |
| Symrise AG | 1597 |
2 |
| Transitions Optical, Inc. | 317 |
2 |
| The University of North Carolina at Chapel Hill | 1928 |
2 |
| Wacker Chemie AG | 2091 |
2 |
| Specialty Operations France | 563 |
2 |
| 3m Innovative Properties Company | 18406 |
1 |
| BASF SE | 19740 |
1 |
| International Business Machines Corporation | 60644 |
1 |
| Other owners | 18 |