Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4867590 | Dot matrix print head carriage with swingable heat sink | Alan H. Walker | 1989-09-19 |
| 4818132 | Optical sensor protective member | Robert F. Bullivant, James R. Del Signore, II, Alan H. Walker | 1989-04-04 |