Issued Patents 1997
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5662183 | High strength matrix material for PDC drag bits | — | 1997-09-02 |
| 5630514 | Cage type cyclone fine screen device | Fenggang Song | 1997-05-20 |
| 5628837 | Surface decarburization of a drill bit having a refined primary cutting edge | Robert W. Britzke, Jimmy W. Eason | 1997-05-13 |
| 5609447 | Surface decarburization of a drill bit | Robert W. Britzke, Jimmy W. Eason | 1997-03-11 |