Issued Patents All Time
Showing 26–28 of 28 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5857650 | Extension for adjustable leg and method of using | — | 1999-01-12 |
| 5645515 | Stilt system | William D. Armstrong | 1997-07-08 |
| 4948149 | Net posts for ball games | Grace Liao | 1990-08-14 |