Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5238543 | Recovery of silver from photographic film and photographic development waste solution | Jeng-Shyong Jean, Pak-Hing Lee, Tei-Chih Cheau | 1993-08-24 |
| 5221325 | Process for recovering silver oxide and metals from spent silver oxide button cells | Bih-Shyang Huang, Pak-Hing Lee, Tei-Chih Cheau | 1993-06-22 |