Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE36452 | Composite seal for rotary cone rock bits | Michael Hooper, Jerry Pyka, Robert X. Chambers, Gary R. Portwood, Randy Johnston | 1999-12-21 |
| 5362073 | Composite seal for rotary cone rock bits | Michael F. Hooper, Gary R. Portwood, Jerry Pyka, Randy Johnston, Robert X. Chambers | 1994-11-08 |
| 4334585 | Insert retention and cooling apparatus for drag bits | — | 1982-06-15 |