Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4298274 | Variable density filter for a multi-magnification copying device | James D. Rees, Kenneth W. Altfather, William L. Lama | 1981-11-03 |
| 4298275 | Radially varying transmission filter for wide angle copying device | James A. Critchlow | 1981-11-03 |