US3246138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low brightness louver for lighting fixture
Assignee: Lightolier Inc
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Filing: 1963-06-11
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Granted: 1966-04-12
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Expires: 1983-06-11
Abstract
No abstract record available.
Inventors
- 👤 Noel S Florence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:29
CPC Classifications
F; F21; F21V; F21V11/00; F21V11/06; F21Y; F21Y2103/00; F21Y2113/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
A LIGHT FIXTURE COMPRISING IN COMBINATION A TUBULAR LIGHT SOURCE, A REFLECTOR ARRANGED IN LIGHT REFLECTING RELATIONSHIP WITH RESPECT TO SAID LIGHT SOURCE, SAID REFLECTOR BEING OPTICALLY CURVED, SAID CURVE BEING BETWEEN A CURVE DEFINED BY AN INTEGRATED SERIES OF PARABOLAS, EACH HAVING ITS AXIS INCLINED FROM THE HORIZONTAL AT THE DESIRED CUTOFF ANGLE, AND HAVING A FOCUS FOR ANY GIVEN POINT ON THE CURVE LOCATED AT THE POINT OF TANGENCY OF A LINE DRAWN BETWEEN THE POINT ON THE CURVE AND TANGENT TO THE LOWER PORTION OF THE TUBULAR LIGHT SOURCE, AND A CURVE DEFINED BY A PARABOLA WITH AN AXIS INCLINED FROM THE HORIZONTAL AT 90* AND HAVING ITS FOCAL POINT AT THE CENTER OF THE TUBULAR LIGHT SOURCE, A SPECULAR LOUVER COUPLED TO SAID REFLECTOR AND SAID LIGHT SOURCE TO RECEIVE AND PASS LIGHT REFLECTED BY SAID REFLECTOR AND SAID LIGHT SOURCE, SAID LOUVER COMPRISING A PLURALITY OF SPACED LONGITUDINALLY EXTENDING SPECULAR BAFFLES HAVING SPECULAR REFLECTING SURFACES ON BOTH
Claim 2
Dependent Claim
162 words
A LIGHT FIXTURE COMPRISING IN COMBINATION A TUBULAR LIGHT SOURCE, A REFLECTOR ARRANGED IN LIGHT REFLECTING RELATIONSHIP WITH RESPECT TO SAID LIGHT SOURCE, SAID REFLECTOR BEING OPTICALLY CURVED, SAID CURVE BEING BETWEEN A CURVE DEFINED BY AN INTEGRATED SERIES OF PARABOLAS, EACH HAVING ITS AXIS INCLINED FROM THE HORIZONTAL AT THE DESIRED CUTOFF ANGLE, AND HAVING A FOCUS FOR ANY GIVEN POINT ON THE CURVE LOCATED AT THE POINT OF TANGENCY OF A LINE DRAWN BETWEEN THE POINT ON THE CURVE AND TANGENT TO THE LOWER PORTION OF THE TUBULAR LIGHT SOURCE, AND A CURVE DEFINED BY A PARABOLA WITH AN AXIS INCLINED FROM THE HORIZONTAL AT 90* AND HAVING ITS FOCAL POINT AT THE CENTER OF THE TUBULAR LIGHT SOURCE, A SPECULAR LOUVER COUPLED TO SAID REFLECTOR AND SAID LIGHT SOURCE TO RECEIVE AND PASS LIGHT REFLECTED BY SAID REFLECTOR AND SAID LIGHT SOURCE, SAID LOUVER COMPRISING A PLURALITY OF SPACED LONGITUDINALLY EXTENDING SPECULAR BAFFLES HAVING SPECULAR REFLECTING SURFACES ON BOTH
References Cited (Backward Citations)
US1989578A
Cited
US2830175A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-11 | 1969-10-11 | 1970-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-11 | 1973-10-11 | 1974-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-11 | 1977-10-11 | 1978-04-12 | $7700.00 | Window Closed / Lapsed |