Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5162106 | Photographic fixer regeneration | Thomas H. Etsell | 1992-11-10 |
| 4755453 | Method for recovering silver from waste solutions containing thiosulfate compounds | Thomas H. Etsell | 1988-07-05 |
| 4388109 | Process for the production of silver powder from silver chloride, sulphate or sulphide | — | 1983-06-14 |
| 4331469 | Process for the recovery of silver values from silver-containing material which also contains iron and arsenic | — | 1982-05-25 |
| 4306902 | Process for the production of elemental silver from silver chloride or silver sulphate | — | 1981-12-22 |