Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6659126 | Backflow preventor with adjustable outflow direction | Dennis Whitelaw, Richard D. Fields | 2003-12-09 |
| 6546946 | Short-length reduced-pressure backflow preventor | — | 2003-04-15 |
| 6349736 | Backflow preventer apparatus and method with integration of shut-off valves | — | 2002-02-26 |
| 5503176 | Backflow preventor with adjustable cutflow direction | Dennis Whitelaw, Richard D. Fields | 1996-04-02 |
| 5385166 | Backflow preventor with adjustable outflow direction | Dennis Whitelaw, Richard D. Fields | 1995-01-31 |
| 5226441 | Backflow preventor with adjustable outflow direction | Dennis Whitelaw | 1993-07-13 |
| 5107888 | N-shaped backflow preventor | — | 1992-04-28 |
| 4989635 | Check valve with reduced hold-open pressure | — | 1991-02-05 |