Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5759942 | Ion exchange resin catalyst for the synthesis of bisphenols and the process for preparing the same | Qiu Tan, Zuquan Jin, Hongshou Jiang, Bingjun Brian He | 1998-06-02 |
| 5663456 | Method for obtaining large crystals with high purity by destructing part of fines in slurry in a crystallizer | Minhua Zhang, Shenbo Yu, Chuanzhao Li, Shenghua Qian | 1997-09-02 |
| 5648561 | Process for the production of high purity and ultrapure bisphenol-A | Qiu Tan, Minhua Zhang, Shenbo Yu, Shenghua Qian, Chuanzhao Li | 1997-07-15 |
| 5629457 | Dephenolizing process for production of high-quality polycarbonate grade bisphenol A | Minhua Zhang, Shenbo Yu, Shenghua Qian, Chuanzhao Li | 1997-05-13 |