Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4887132 | Electrographic development apparatus having a ribbon blender | Thomas K. Hilbert | 1989-12-12 |
| 4884105 | Reproduction apparatus having a sprocket-driven transfer drum | Leo G. Procter, Carl W. Roy | 1989-11-28 |