Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7156121 | Valve position monitor and method of use | Christopher L. Cox | 2007-01-02 |
| 6192912 | Low profile pneumatically activated valve assembly | Ronald G. Butler, Edwin R. Tipton, John R. Lehman, Bruce Rowits | 2001-02-27 |
| 6079441 | Adjustable electronic position indicator apparatus | Roy D. Miller, Ronald G. Butler, John R. Lehman | 2000-06-27 |
| 5649567 | Sealing arrangement, for use with, and in combination with, a steam and fuel oil control and furge valve, and a valve seat therefor | Ronald G. Butler, John R. Lehman, Roy D. Miller | 1997-07-22 |
| 5277401 | Tank bottom diaphragm valve | Ronald G. Butler, Richard Dolan Randall | 1994-01-11 |
| 4683906 | Trunnion type ball valve | Ronald G. Butler, John R. Lehman, Douglas Stuart Gray | 1987-08-04 |