Issued Patents All Time
Showing 1–20 of 20 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5303022 | Lensometer with guided lens movement for progressive addition lens | Charles E. Campbell, James E. Sheedy | 1994-04-12 |
| 5157427 | Objective refractor | — | 1992-10-20 |
| 4739410 | Superimposed analog video image on plotted digital field tester display | Donald E. Lehmer | 1988-04-19 |
| 4732466 | Fundus camera | — | 1988-03-22 |
| 4730910 | Wide angle lens system having flare rejection properties | — | 1988-03-15 |
| 4707090 | Objective refractor for the eye | — | 1987-11-17 |
| 4675736 | Superimposed analog video image on plotted digital field tester display | Donald E. Lehmer | 1987-06-23 |
| 4669835 | Objective refractor for the eye | — | 1987-06-02 |
| 4650301 | Objective refractor for the eye | — | 1987-03-17 |
| 4640596 | Objective refractor for the eye | — | 1987-02-03 |
| 4607922 | Method for aligning an eye examination instrument with the eye under examination | — | 1986-08-26 |
| 4561738 | Field tester | Charles E. Campbell | 1985-12-31 |
| 4560259 | Objective refractor for the eye | — | 1985-12-24 |
| 4540254 | Keratometer having peripheral light entrance and exit paths | — | 1985-09-10 |
| 4420228 | Method and apparatus for analysis of corneal shape | — | 1983-12-13 |
| 4415239 | Reflection rejection spherical optical train composed of tipped lens elements | — | 1983-11-15 |
| 4407572 | Keratometer | — | 1983-10-04 |
| 4199816 | Optical calibration apparatus and procedure | — | 1980-04-22 |
| 4189215 | Method and apparatus for the corneal positioning of a patient's eye | — | 1980-02-19 |
| 4182572 | Lensmeter utilizing non-parallel light | — | 1980-01-08 |