Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5216458 | Apparatus and method for testing visual accuity and contrast sensitivity | Joseph F. Andera, Richard Unger | 1993-06-01 |
| 4844607 | Vision tester with color corrected illuminating system | Joseph F. Andera | 1989-07-04 |