Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6325091 | Water distribution apparatus for multiple sewer drain trap primer systems | Brian Weltman | 2001-12-04 |
| 5797419 | Sewer line trap priming assembly and antisiphoning conduit component therefor | Frank W. Dowdican | 1998-08-25 |
| 5678588 | Sewer line multiple trap priming system and method | Frank W. Dowdican | 1997-10-21 |
| 5385172 | Ping-free water hammer arrester | Suzuki Kouichi | 1995-01-31 |
| 5263508 | Sewer line water trap charging valve with improved adjustment for house line pressure changes | — | 1993-11-23 |
| 5253670 | Multiple drain trap primer valve assembly for sewer lines | — | 1993-10-19 |
| 4926897 | Automatic fluid pressure equalizing valve | — | 1990-05-22 |
| 4712574 | Vacuum-breaking valve for pressurized fluid lines | — | 1987-12-15 |
| 4644972 | Floating seal valve assembly | — | 1987-02-24 |