Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4816727 | Vibratory interference sensor | I. Stuart Smith, Stephen Christensen, Xiaochuan Lu | 1989-03-28 |
| 4804896 | Vibratory interference sensor | I. Stuart Smith, Stephen Christensen, Richard Lu | 1989-02-14 |