Patent US3179797A successfully refreshed from Google Patents.
US3179797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for controlling glare in luminaire
Assignee: Holophane Corp
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Filing: 1962-01-02
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Granted: 1965-04-20
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Expires: 1982-01-02
Abstract
No abstract record available.
Inventors
- 👤 Franck Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:56
CPC Classifications
F; F21; F21V; F21V5/00; F21V5/02; F21V11/00; F21Y; F21Y2103/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
IN A LUMINAIRE HAVING AN ELONGATED LIGHT SOURCE, A LIGHT DIFFUSER COMPRISED COMPLETELY OF A PLURALITY OF ELONGATED PARALLEL PRISMS LYING IN FLAT HORIZONTAL PLANES AND EXTENDING BENEATH AND TRANSVERSELY OF SAID ELONGATED LIGHT SOURCE, EACH OF SAID PRISMS IN TRANSVERSE SECTION HAVING A BASE AND TWO CURVED SURFACE CONVERGING UPWARDLY FROM SAID BASE AND TOWARD SAID LIGHT SOURCE AND BEING SYMMETRICAL ON EITHER SIDE OF A PLANE THROUGH THE APEX THEREOF, EACH CURVED SURFACE OF EACH OF SAID PRISMS RECEIVING DOWNWARD COMPONENTS OF LIGHT FROM SAID LIGHT SOURCE BETWEEN PREDETERMINED DOWNWARD ANGLE REFRACTING SUBSTANTIALLY ALL OF SAID LIGHT DOWNWARDLY AT APREDETERMINED ANGLE RELATIVE TO NADIR, SAID PREDETERMINED ANGLE RELATIVE TO NADIR CORRESPONDING SUBSTANTIALLY TO THE LOWEST ANGLE OF SAID PREDETERMINED ANGLES BETWEEN WHICH SAID CURVED SURFACES RECEIVE SAID LIGHT.
Claim 2
Dependent Claim
130 words
IN A LUMINAIRE HAVING AN ELONGATED LIGHT SOURCE, A LIGHT DIFFUSER COMPRISED COMPLETELY OF A PLURALITY OF ELONGATED PARALLEL PRISMS LYING IN FLAT HORIZONTAL PLANES AND EXTENDING BENEATH AND TRANSVERSELY OF SAID ELONGATED LIGHT SOURCE, EACH OF SAID PRISMS IN TRANSVERSE SECTION HAVING A BASE AND TWO CURVED SURFACE CONVERGING UPWARDLY FROM SAID BASE AND TOWARD SAID LIGHT SOURCE AND BEING SYMMETRICAL ON EITHER SIDE OF A PLANE THROUGH THE APEX THEREOF, EACH CURVED SURFACE OF EACH OF SAID PRISMS RECEIVING DOWNWARD COMPONENTS OF LIGHT FROM SAID LIGHT SOURCE BETWEEN PREDETERMINED DOWNWARD ANGLE REFRACTING SUBSTANTIALLY ALL OF SAID LIGHT DOWNWARDLY AT APREDETERMINED ANGLE RELATIVE TO NADIR, SAID PREDETERMINED ANGLE RELATIVE TO NADIR CORRESPONDING SUBSTANTIALLY TO THE LOWEST ANGLE OF SAID PREDETERMINED ANGLES BETWEEN WHICH SAID CURVED SURFACES RECEIVE SAID 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) | 1968-04-19 | 1968-10-19 | 1969-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-19 | 1972-10-19 | 1973-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-19 | 1976-10-19 | 1977-04-20 | $7700.00 | Window Closed / Lapsed |