Issued Patents All Time
Showing 26–30 of 30 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5090497 | Flexible coupling for progressive cavity downhole drilling motor | Herb Beimgraben, Benny Melton, Jay M. Eppink | 1992-02-25 |
| 4768598 | Fluid pressure actuated bypass and pressure indicating relief valve | — | 1988-09-06 |
| 4629011 | Method and apparatus for taking core samples from a subterranean well side wall | — | 1986-12-16 |
| 4573529 | High flow injection anchor | — | 1986-03-04 |
| 4275795 | Fluid pressure actuated by-pass and relief valve | Herbert W. Beimgraben | 1981-06-30 |