Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5880680 | Apparatus and method for determining boring direction when boring underground | Austin L. Widener, Jian Jin | 1999-03-09 |
| 5850624 | Electronic compass | Michael F. Gard, Jian Jin | 1998-12-15 |
| 5703484 | Roll independent variable inductance inclinometer | John W. Bieberdorf, Greg W. Draper | 1997-12-30 |