Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6070642 | Protective roller screen assembly | June Douglas | 2000-06-06 |
| 5005844 | Travois with roller assembly | Vivian T. Douglas | 1991-04-09 |
| 4838565 | Rolling travois | Vivian T. Douglas | 1989-06-13 |