Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4492465 | Retro-reflective electro-optical angle measuring system | Robert I. Gellert | 1985-01-08 |
| 4443103 | Retro-reflective electro-optical angle measuring system | Robert I. Gellert | 1984-04-17 |
| 4399675 | Apparatus and method for sheet metal part alignment | Robert I. Gellert, Jan-Bertil Jeppsson | 1983-08-23 |