Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8408519 | Gate valve with lubricated secondary seal | Robert Ohlson, Christopher Eric Cooper, Viet Nguyen | 2013-04-02 |
| 8251086 | Rotary gate valve with secondary seal | Johnny Ellis, John W. Muran, Viet Nguyen | 2012-08-28 |
| 8056882 | Gate valve with lubricated secondary seal | Robert Ohlson, Christopher Eric Cooper | 2011-11-15 |
| 7815170 | Valve assembly having a reinforced valve seat | Donald L. Devine, Jr., John W. Muran | 2010-10-19 |
| 5979874 | Split knife gate valve having a uniformly compressed and constrained resilient gate seat and method for producing the same | Darrel J. DesRochers | 1999-11-09 |
| 5653423 | Knife gate valve with mechanically retained gate seat | Calvin Young, Jon A. Hansen, Nolan D. King, Darrel J. DesRochers, Richard A. Sutherland | 1997-08-05 |
| 5560587 | Gate valve sleeve | Andrew J. McCutcheon, Jeffrey M. Bowman | 1996-10-01 |
| 5338006 | Gate valve with improved seal unit | Andrew J. McCutcheon, Jeffrey M. Bowman | 1994-08-16 |
| 4623122 | Valve with improved seal | — | 1986-11-18 |