Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9976231 | Fixed cutter drill bit cutter elements including hard cutting tables made from CVD synthetic diamonds | Guodong Zhan | 2018-05-22 |
| 9193037 | Preparation of nanocrystalline diamond coated diamond particles and applications thereof | Guodong Zhan, Michael Dean Hughes, Anil Kumar | 2015-11-24 |
| 9156136 | Systems and methods for vapor pressure leaching polycrystalline diamond cutter elements | Guodong Zhan, Walter R. Rothrock, Parul Walia Dhall, Terry R. Matthias | 2015-10-13 |
| 6416224 | Rolling cutter drill bits | Ranjit Singh, Jeffery E. Daly | 2002-07-09 |
| 6354740 | Rolling cutter drill bits | Ranjit Singh, Jeffery E. Daly | 2002-03-12 |
| 5725313 | Rolling cutter drill bits | Ranjit Singh, Jeffery E. Daly | 1998-03-10 |