Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4918630 | Computer timing system having backup trigger switches for timing competitive events | Donald A. Plouff | 1990-04-17 |
| 4832445 | Security diffraction devices difficult to exactly duplicate | Kenneth A. Haines | 1989-05-23 |