Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4650356 | Ribbon cartridge motion control with a non-concentric drive | Billy D. Purcell | 1987-03-17 |
| 4636098 | Ribbon drive coupling and cartridge tilt arrangement for print line visibility | Edward A. Halter, Billy D. Purcell | 1987-01-13 |
| 4467976 | Ribbon cartridge comprising a stuffer box intermediate a supply reel and take-up reel | Francis W. Bogaczyk, Richard C. Croll, Billy D. Purcell | 1984-08-28 |
| 4359288 | Single pass ribbon cartridge for impact printers having means to prevent incorrect insertion | Robert L. Bullock, Billy D. Purcell, William Joseph Thornhill | 1982-11-16 |