Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6343618 | Swing check backflow preventer | Greg L. Britt, Timothy D. Price, Robert V. Funderburk | 2002-02-05 |
| 4907812 | Bi-directional unsupported area seal | — | 1990-03-13 |
| 4658848 | Heat responsive backseat for gate valves | William S. Shelton | 1987-04-21 |
| 4575106 | High pressure sealing connection with metal seal | F. Harold Hollister, Tri C. Le | 1986-03-11 |
| 4570942 | Dual diameter valve stem packing | Robert J. Diehl, F. Harold Hollister | 1986-02-18 |
| 4515174 | Gate valve with internal pressure relief means | F. Harold Hollister | 1985-05-07 |
| 4486003 | Gate valve structure | George A. Moran | 1984-12-04 |
| 4474203 | Valve with pressure energized back seat sealing means | — | 1984-10-02 |
| 4468039 | Packing ring cartridge with adjusting screws | Tri C. Le, John B. Williams, Jr. | 1984-08-28 |
| 4384726 | Expandable lubricating packing assembly for wellheads | — | 1983-05-24 |
| 4364542 | Packing gland assembly | — | 1982-12-21 |
| 4341369 | Expanding gate valve assembly | — | 1982-07-27 |
| 4320890 | Valve seat structure | William S. Shelton | 1982-03-23 |