Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5184912 | Split-ring manhole cover support | Harold M. Bowman | 1993-02-09 |
| 5150984 | Stiffening flanges for deformation resistance of manhole cover support | Harold M. Bowman | 1992-09-29 |