Issued Patents All Time
Showing 1–16 of 16 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6516543 | Snow grooming apparatus and system | J. Douglas Irving | 2003-02-11 |
| 5840274 | Deflation resistant tire and insert apparatus | — | 1998-11-24 |
| 5181605 | Key cover | Richard A. Thom, Frank L. Breveglieri | 1993-01-26 |
| 5083662 | Key cover | Richard A. Thom | 1992-01-28 |
| 5054833 | Releasable overshot | Herschel E. Zirger | 1991-10-08 |
| 4877217 | Fail-safe blowout preventer | Archie W. Peil | 1989-10-31 |
| 4706745 | Lock-down releasing spear assembly | Wayne A. Kovar, Clyde D. Roque | 1987-11-17 |
| 4648447 | Casing scraper | Archie W. Peil, Arnal B. Foreman, Jr. | 1987-03-10 |
| 4456215 | Inner seal and support rod assembly for high pressure blowout preventers | Arnal B. Foreman, Jr. | 1984-06-26 |
| 4439167 | Shock absorber assembly | Archie W. Peil, Wayne A. Kovar, Roger Chancey | 1984-03-27 |
| 4398729 | Blowout preventer inner ram seal assembly | Archie W. Peil | 1983-08-16 |
| 4387885 | Shock absorber assembly for absorbing shocks encountered by a drill string | Roger Chancey, Wayne A. Kovar | 1983-06-14 |
| 4386871 | Interlocking bed frame members | Richard B. Hooker | 1983-06-07 |
| 4369977 | Seal for an overshot and a method of doing same | Archie W. Peil | 1983-01-25 |
| 4331006 | Shock absorber assembly | — | 1982-05-25 |
| 4225265 | Interlocking bed frame members | Richard B. Hooker | 1980-09-30 |