Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7201534 | Apparatus and method to secure manhole accessways | — | 2007-04-10 |
| 6881007 | Apparatus and method to secure manhole accessways | — | 2005-04-19 |
| 5997213 | Ditch check | Gilbert Barber | 1999-12-07 |