Issued Patents All Time
Showing 1–15 of 15 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8567434 | Closing and sealing means for air admittance valves in sanitary waste water pipe systems | Han Sin Low | 2013-10-29 |
| 7908685 | Water trap for sanitary appliances | — | 2011-03-22 |
| 6532988 | Air admittance valve for sanitary waste pipe system | — | 2003-03-18 |
| 5836345 | Vacuum breaker vent valve packaging and installation system | — | 1998-11-17 |
| 5725099 | Vacuum breaker vent valve packaging and installation system | — | 1998-03-10 |
| 5625909 | Sanitary appliance with indirect discharge | — | 1997-05-06 |
| 4991623 | Automatic air valves for ducts | — | 1991-02-12 |
| 4974632 | Automatic air valves for ducts | — | 1990-12-04 |
| 4777676 | Sanitary appliances with an indirect outlet and hidden drainage mechanism | — | 1988-10-18 |
| 4535807 | Automatic air valve device for ducts | — | 1985-08-20 |
| 4524795 | Hydraulic device for the drainage of waste water | Gijsbrecht H. J. van Olst | 1985-06-25 |
| 4440406 | Devices used for the connection of pipes | — | 1984-04-03 |
| 4318547 | Devices used for the connection of pipes | — | 1982-03-09 |
| 4232706 | Automatic valve device for sanitation waste pipes | — | 1980-11-11 |
| 4212314 | Waste water outlet sanitary plant comprising a siphon | — | 1980-07-15 |