Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5987380 | Hand-held GPS-mapping device | Douglas J. Backman, Gene Roe, William R. Michalson | 1999-11-16 |
| 5902347 | Hand-held GPS-mapping device | Douglas J. Backman, Gene Roe, William R. Michalson | 1999-05-11 |