Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5934645 | Rotary valve with pressure energized seal | — | 1999-08-10 |
| 5765815 | Rotary valve with pressurized energized seal | — | 1998-06-16 |
| 5244183 | Fugitive emission sealing assembly | Edward G. Holtgraver | 1993-09-14 |
| 4899775 | Corrosion-resistant overlay for the edge of butterfly valves | — | 1990-02-13 |
| 4846441 | Methods and apparatus for adjusting a valve closure member | William B. Scobie | 1989-07-11 |
| 4773625 | Corrosion-resistant overlay for the edge of butterfly valves | — | 1988-09-27 |
| 4317384 | Manual override drive apparatus | Richard C. Babb | 1982-03-02 |
| 4269211 | Steam manifold distribution system for providing equal quality of steam in two lines | Curtis E. Howard | 1981-05-26 |
| 4205725 | Method for forming an automatic burner for in situ combustion for enhanced thermal recovery of hydrocarbons from a well | Curtis E. Howard, Robert W. Pitts, Jr. | 1980-06-03 |