Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5250317 | Products from treatment of black tea | Richard T. Liu | 1993-10-05 |
| 5139802 | Oxidation of tea | Richard T. Liu | 1992-08-18 |
| 5130154 | Treatment of black tea | Richard T. Liu | 1992-07-14 |
| 4837038 | Decaffeination process | William S. Symbolik | 1989-06-06 |