Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5218177 | Screened pattern causing gaps around keyboard membrane spacer hole to increase venting and reduced bounce | Edwin T. Coleman, III, Philip Cullen | 1993-06-08 |
| 4310257 | Typewriter cartridge lock-down | Thomas R. Field | 1982-01-12 |