Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4371247 | Arrangement for eliminating ammonia vapors from developed diazo copy material | Robert K. Hewelt | 1983-02-01 |
| 4273435 | Method and arrangement for eliminating ammonia vapors from developed diazo copy material | Robert K. Hewelt | 1981-06-16 |