Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 4686540 | Compact plotter for generation of accurate plotted images of long length | Elmer N. Leslie, Stephen S. Treadwell, Larry D. Propst, Richard T. Kushmaul, Paul A. Abney +2 more | 1987-08-11 | |
| 4557474 | Duplex document copying machines | James W. Davis, Larry D. Propst | 1985-12-10 | $3,226,000 |