Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4859052 | Portable screen assembly for visual acuity testing | Diana R. McFarland, Robert P. Ginsburg | 1989-08-22 |
| 4800404 | Apparatus and method for testing visual sensitivity to glare | David W. Evans, Kenneth Blauvelt | 1989-01-24 |