Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8317049 | Vacuum breaker arrangement with externally protruding collapsible valve part | Christian A. Mutzbauer | 2012-11-27 |
| 6629621 | Gauge hatch with liquid seal | Martin Clift, Baohai Liu | 2003-10-07 |
| 6244457 | Gauge hatch with diaphragm and liquid seal | Martin Clift | 2001-06-12 |
| 6056005 | Vent valve with liquid seal | Martin Clift, Baohai Liu | 2000-05-02 |
| 5660204 | Tank blanketing valve | William J. Zehr, Scott R. Diaz | 1997-08-26 |