Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11686419 | Concrete sanitary sewer pipes and manholes featuring a protective plastic liner | — | 2023-06-27 |
| 9011035 | Integrated frame and cover system | — | 2015-04-21 |
| 8573883 | Integrated frame and cover system | — | 2013-11-05 |
| 6968854 | Manhole base | John Mokrzycki | 2005-11-29 |
| 4541240 | Exhaust system for internal combustion engines | — | 1985-09-17 |
| 4393652 | Exhaust system for internal combustion engines | — | 1983-07-19 |