Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5345728 | Sewer chimney coupling | — | 1994-09-13 |
| 5293719 | Sewer chimney coupling | — | 1994-03-15 |
| 5189861 | Sewer chimney coupling and method of building a sewer chimney | — | 1993-03-02 |
| 4243068 | Sewer chimney | Thomas G. Thompson | 1981-01-06 |