Humphrey Instruments, Inc.
34Patents
0Active
34Granted
36Portfolio score
Filing activity: Mar 18, 1974 → Dec 22, 1993
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4420228A | Method and apparatus for analysis of corneal shape | Human Necessities | 40 | Expired |
| US4732466A | Fundus camera | Human Necessities | 37 | Expired |
| US4199816A | Optical calibration apparatus and procedure | Physics | 34 | Expired |
| US4650301A | Objective refractor for the eye | Human Necessities | 30 | Expired |
| US4640596A | Objective refractor for the eye | Human Necessities | 28 | Expired |
| US4669835A | Objective refractor for the eye | Human Necessities | 28 | Expired |
| US4070115A | Lens meter | Physics | 28 | Expired |
| US4540254A | Keratometer having peripheral light entrance and exit paths | Human Necessities | 26 | Expired |
| US4180325A | Lens meter with automated readout | Physics | 22 | Expired |
| US4043644A | Elastically compensated off-axis mirror | Physics | 21 | Expired |
| US5491757A | Field tester gaze tracking using content addressable memories to improve image data analysis speed | Human Necessities | 20 | Expired |
| US4675736A | Superimposed analog video image on plotted digital field tester display | Human Necessities | 19 | Expired |
| US4695831A | Light pen having actuating accelerometer | Physics | 17 | Expired |
| US4407572A | Keratometer | Human Necessities | 15 | Expired |
| US4182572A | Lensmeter utilizing non-parallel light | Physics | 15 | Expired |
| US4730910A | Wide angle lens system having flare rejection properties | Physics | 14 | Expired |
| US3947097A | Process and apparatus for astigmatic and spherical subjective testing of the eye | Human Necessities | 14 | Expired |
| US4098002A | Apparatus for locating inter-pupilary of nose bridge mounted spectacles to lens meter | Physics | 13 | Expired |
| US5461436A | Color field test with occlusion of non-tested eye | Human Necessities | 12 | Expired |
| US4130361A | Lens meter without relatively moving optical parts | Physics | 12 | Expired |
| US5323194A | Perimeter with non spherical bowl | Human Necessities | 12 | Expired |
| US4415239A | Reflection rejection spherical optical train composed of tipped lens elements | Physics | 11 | Expired |
| US4561738A | Field tester | Human Necessities | 10 | Expired |
| US5339151A | Spectrometer for lensometer | Physics | 9 | Expired |
| US4015899A | Eye test apparatus with physician routed patient input adjustment to variable optical elements | Human Necessities | 9 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.