Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5081281 | Process for the preparation of 3,3',4,4'-biphenyltetracarboxylic acid and its derivatives | Mengxian Ding, Zhenghua YANG, Jing Zhang | 1992-01-14 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5081281 | Process for the preparation of 3,3',4,4'-biphenyltetracarboxylic acid and its derivatives | Mengxian Ding, Zhenghua YANG, Jing Zhang | 1992-01-14 |