Patent US3406681A successfully refreshed from Google Patents.
US3406681A
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Method of determining strain condition of the eye
Assignee: Vishay Intertechnology Inc
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Filing: 1963-05-13
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Granted: 1968-10-22
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Expires: 1983-05-13
Abstract
No abstract record available.
Inventors
- 👤 Zandman Felix
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:21
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
76 words
A METHOD FOR INVESTIGATING THE PHYSIOLOGICAL AND HEALTH CONDITION OF THE LIVING EYE THROUGH PHOTOELASTIC PATTERNS WHICH COMPRISES PROJECTING POLARIZED LIGHT THROUGH THE CORNEA TO THE IRIS TO PRODUCE REFLECTION OF LIGHT THEREFROM, THE CORNEA PRODUCING BIREFRINGENCE OF THE LIGHT PASSING THERETHROUGH, AND RECEIVING AND ANALYZING THE LIGHT REFLECTED BACK THROUGH THE CORNEA BY THE IRIS WHEREBY THE STRESSES AND STRAINS IN THE CORNEA PRODUCE BIREFRINGENCE RESULTING IN SIGNIFICANT PATTERNS OF THE RECEIVED AND ANALYZED LIGHT.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-22 | 1972-04-22 | 1972-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-22 | 1976-04-22 | 1976-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-22 | 1980-04-22 | 1980-10-22 | $7700.00 | Window Closed / Lapsed |