Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7832958 | Swing-out manhole cover | Kevin S. Vrondran, Jeremy I. Johnson | 2010-11-16 |
| 7341398 | Lift-assisted manhole cover | Jeremy I. Johnson, Scott B. Beal, Herbert Carl Barnum, William R. Austin, James F. Malpass +4 more | 2008-03-11 |