Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5261761 | ABS manhole adapter serving as a coupling-collar of a resilient connector assembly used in making a connection between a precast reinforced concrete manhole and a PVC sewer pipe | James H. Knappert, Tony A. Wall | 1993-11-16 |