Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8960223 | Plug valve with an internal check valve | Robert Keith Stoddard, Jr., Lee Ernie Treichel | 2015-02-24 |
| 6892748 | Plug valve | Thomas E. Malone | 2005-05-17 |
| 6354324 | Slide valve with welded internals | — | 2002-03-12 |
| 6170528 | Assembly of orifice chambers progressively reducing operating pressure for large gas flows | — | 2001-01-09 |
| 6050288 | Slide valve with welded internals | — | 2000-04-18 |
| 5979870 | Butterfly value with offset stem | — | 1999-11-09 |
| RE36121 | Plug valve | — | 1999-03-02 |
| 5540253 | Plug valve | — | 1996-07-30 |
| 5303740 | Line blind assembly having disc and spacer ring selectively disposable between ends of tubular members | — | 1994-04-19 |
| 5303742 | Line blind assembly having interchangeable DISC | — | 1994-04-19 |
| 5269493 | Butterfly valve | — | 1993-12-14 |
| 5062445 | Water cooled gate valve | — | 1991-11-05 |
| 5029608 | Diverter valve | — | 1991-07-09 |
| 4899899 | Pressure vessel | — | 1990-02-13 |
| 4827967 | Plug valve | — | 1989-05-09 |
| 4813817 | Plug valve | — | 1989-03-21 |