Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6016826 | Automatic center cavity equalizing valve | Leonard J. Stephens | 2000-01-25 |
| 5288054 | Globe valve and method for making same | Leonard J. Stephens | 1994-02-22 |
| 4577872 | Valve stem seal with multiple ring means | Clair W. Hartle, Jr. | 1986-03-25 |
| 4522230 | Orifice plate seal ring for controlled closure check valve | Robert L. Clapper, Richard J. Gradle | 1985-06-11 |
| RE30989 | Sealed valve and related structure | William G. Lunt | 1982-07-06 |
| 4257714 | Device for coupling a pair of rods | Andrew Hankosky, Robert L. Clapper | 1981-03-24 |
| 4234011 | Plug valve construction | E. Frederick Schoeneweis | 1980-11-18 |