Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7325822 | Trailer tandem release handle tool | Roger Elmo Humphreys | 2008-02-05 |
| 5285190 | Automatic slack adjuster with operation and adjustment monitor | Roger Elmo Humphreys | 1994-02-08 |