Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4304464 | Background compensating interferometer | Henry A. Hill, Paul T. Ballard | 1981-12-08 |
| 4213706 | Background compensating interferometer | Henry A. Hill, Paul T. Ballard | 1980-07-22 |