Issued Patents All Time
Showing 26–28 of 28 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4385808 | Point focus refracting radiation concentrator | — | 1983-05-31 |
| 4380374 | Variable focal length projection lens for use on overhead projectors | — | 1983-04-19 |
| 4206969 | Directional front projection screen | Sanford Cobb, Jr., Terrence M. Conder | 1980-06-10 |