Issued Patents 2011
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7987920 | Multi-mode drill with mode collar | James D. Schroeder, Paul K. Trautner | 2011-08-02 |
| 7898131 | External voltage change device | Frank Edward Staigl, III, Ngan Fai Leung, Dennis Studebaker | 2011-03-01 |