Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7988315 | Simultaneous multiple light source viewer | Raymond J Kallio, Louis N Chappo | 2011-08-02 |
| D288332 | Casing for portable viewer | — | 1987-02-17 |
| 4531317 | Portable viewing apparatus | — | 1985-07-30 |
| 4298124 | Slide programming device | — | 1981-11-03 |