Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6425724 | Hand truck with pusher plate | — | 2002-07-30 |
| 6227789 | Hand truck with pusher plate | — | 2001-05-08 |
| 5993134 | Hand truck with load lifting mechanism | — | 1999-11-30 |
| 5256025 | Handtruck | — | 1993-10-26 |
| 4849734 | Self-diagnostic circuit for alarm-systems | — | 1989-07-18 |
| 4625198 | Alarm system diagnostic apparatus | Oscar Williamson, III | 1986-11-25 |