Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5030975 | Charge transfer imaging cartridge | Robert McCallum, Robert C. Kostash | 1991-07-09 |
| 4890123 | Print cartridge | Robert McCallum | 1989-12-26 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5030975 | Charge transfer imaging cartridge | Robert McCallum, Robert C. Kostash | 1991-07-09 |
| 4890123 | Print cartridge | Robert McCallum | 1989-12-26 |