Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4772869 | Communication apparatus | Michael T. Callas | 1988-09-20 |
| D277738 | Combined road marker and lock-in sign | Michael T. Callas | 1985-02-26 |
| D277739 | Combined road marker and flashing light | Michael T. Callas | 1985-02-26 |