Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D305673 | Emergency vehicle warning sign | Michael R. Smith | 1990-01-23 |
| 4775865 | Emergency vehicle warning and traffic control system | Michael R. Smith, Henry L. Pfister | 1988-10-04 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D305673 | Emergency vehicle warning sign | Michael R. Smith | 1990-01-23 |
| 4775865 | Emergency vehicle warning and traffic control system | Michael R. Smith, Henry L. Pfister | 1988-10-04 |