US3343449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Veiling luminance measurement device
Assignee: PHOTO RES CORP
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Filing: 1966-02-07
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Granted: 1967-09-26
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Expires: 1986-02-07
Abstract
No abstract record available.
Inventors
- 👤 Blackwell Harold Richard
- 👤 Glenn A Fry
- 👤 Mildred M Pritchard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:25
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/42; G01J1/02; G01J1/04; G01J1/0407; G01J1/0455; G01J1/0474
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
IN A DEVICE FOR MEASURING VEILING LUMINANCE, A COMBINATION OF: A GLARE LENS HAVING AN OPTICAL AXIS AND AN ASPHERICAL REFRACTIVE SURFACE, SAID SURFACE INCLUDING INCREMENTAL AREAS TO REFRACT INCIDENT LIGHT FROM SOURCES IN SPACED RELATION TO SAID OPTICAL AXIS TO RENDER A PORTION OF SAID REFRACTED LIGHT SUBSTANTIALLY PARALLEL TO ITS OPTICAL AXIS IN PROPORTION OF THE VEILING LUMINANCE EFFECT OF SAID LIGHT SOURCES WITH RESPECT TO THE SUBJECT MATTER BEING MEASURED, SAID LIGHT SOURCES BEING LOCATED WITHIN 90* FROM THE OPTICAL AXIS OF SAID LENS; AN OBJECTIVE LENS TO RECEIVE REFRACTED LIGHT FROM SAID GLARE LENS; A PHOTOSENSOR MEANS SPACED FROM SAID OBJECTIVE LENS; AND A PLATE HAVING AN APERTURE AT THE FOCAL PLANE OF SAID OBJECTIVE LENS FOR TRANSMITTING TO THE PHOTOSENSOR ONLY REFRACTED LIGHT PROPORTIONATE TO THE VEILING LUMINANCE EFFECT OF THE LIGHT SOURCE; SAID ASPHERICAL SURFACE BEING SUBSTANTIALLY DETERMINED BY EVALUATION Y AND R FOR VARIOUS VALUES OF 0 IN THE FOLLOWING EQUATIONS:
Claim 2
Dependent Claim
158 words
IN A DEVICE FOR MEASURING VEILING LUMINANCE, A COMBINATION OF: A GLARE LENS HAVING AN OPTICAL AXIS AND AN ASPHERICAL REFRACTIVE SURFACE, SAID SURFACE INCLUDING INCREMENTAL AREAS TO REFRACT INCIDENT LIGHT FROM SOURCES IN SPACED RELATION TO SAID OPTICAL AXIS TO RENDER A PORTION OF SAID REFRACTED LIGHT SUBSTANTIALLY PARALLEL TO ITS OPTICAL AXIS IN PROPORTION OF THE VEILING LUMINANCE EFFECT OF SAID LIGHT SOURCES WITH RESPECT TO THE SUBJECT MATTER BEING MEASURED, SAID LIGHT SOURCES BEING LOCATED WITHIN 90* FROM THE OPTICAL AXIS OF SAID LENS; AN OBJECTIVE LENS TO RECEIVE REFRACTED LIGHT FROM SAID GLARE LENS; A PHOTOSENSOR MEANS SPACED FROM SAID OBJECTIVE LENS; AND A PLATE HAVING AN APERTURE AT THE FOCAL PLANE OF SAID OBJECTIVE LENS FOR TRANSMITTING TO THE PHOTOSENSOR ONLY REFRACTED LIGHT PROPORTIONATE TO THE VEILING LUMINANCE EFFECT OF THE LIGHT SOURCE; SAID ASPHERICAL SURFACE BEING SUBSTANTIALLY DETERMINED BY EVALUATION Y AND R FOR VARIOUS VALUES OF 0 IN THE FOLLOWING EQUATIONS:
References Cited (Backward Citations)
US3134021A
Cited
US3121170A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-25 | 1971-03-27 | 1971-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-25 | 1975-03-27 | 1975-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-25 | 1979-03-27 | 1979-09-26 | $7700.00 | Window Closed / Lapsed |