Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6125878 | Sewer inspection chamber with back-flow prevention valve and method and apparatus for installing valve in sewer inspection chamber | — | 2000-10-03 |
| 6029684 | Sewer inspection chamber with back-flow prevention valve | — | 2000-02-29 |
| 5826609 | Sewer inspection chamber with back-flow prevention valve and method and apparatus for installing valve in sewer inspection chamber | — | 1998-10-27 |
| 5409615 | Temperature controlled grease trap | Lloyd Wallman | 1995-04-25 |