Issued Patents 1994
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5362073 | Composite seal for rotary cone rock bits | Robert G. Upton, Michael F. Hooper, Gary R. Portwood, Jerry Pyka, Randy Johnston | 1994-11-08 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5362073 | Composite seal for rotary cone rock bits | Robert G. Upton, Michael F. Hooper, Gary R. Portwood, Jerry Pyka, Randy Johnston | 1994-11-08 |