Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8075000 | Composite, high temperature, dynamic seal and method of making same | John E. Schroeder, Rome Richardson, Lannie L. Dietle | 2011-12-13 |
| 6123337 | Composite earth boring bit seal | Zhigang Fang, Sujian Huang, Chris E. Cawthorne, G. Steve Kyker, Robert Denton +1 more | 2000-09-26 |
| 5842700 | Composite rock bit seal | Zhigang Fang, Sujian Huang, Chris E. Cawthorne, G. Steven Kyker, Robert Denton | 1998-12-01 |