Issued Patents All Time
Showing 1–16 of 16 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6050293 | Flapper check valve | Ping-Ting Lin | 2000-04-18 |
| 5855224 | Flapper check valve | Ping-Ting Lin | 1999-01-05 |
| 5642859 | Temperature-sensitive safety valve assembly | — | 1997-07-01 |
| 5566704 | Backflow preventer and test cock assembly | Steven Hofmann | 1996-10-22 |
| 5564467 | Poppet check valve | — | 1996-10-15 |
| 5341987 | Temperature control flow valve | — | 1994-08-30 |
| 5287877 | Sewer drain trap primer valve | — | 1994-02-22 |
| 5236009 | Double check backflow preventer with improved toggle linkage check valve | — | 1993-08-17 |
| 5176172 | Toggle linkage check valve | — | 1993-01-05 |
| 5129416 | Anti-siphon frost-proof water hydrant | — | 1992-07-14 |
| 5125429 | Piston pressure-type vacuum breaker | Steven Hofmann | 1992-06-30 |
| 5072753 | Toggle linkage check valve | — | 1991-12-17 |
| 5052655 | Ball valve lock plate | — | 1991-10-01 |
| 5029603 | Anti-siphon frost-proof water hydrant | — | 1991-07-09 |
| 4821763 | Tamperproof coupling | Mark Thomas Corcoran | 1989-04-18 |
| 4241752 | Backflow preventer | — | 1980-12-30 |