Patent US3294964A successfully refreshed from Google Patents.
US3294964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polarized ceiling panel
Assignee: United Lighting and Ceiling Co
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Filing: 1965-09-20
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Granted: 1966-12-27
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Expires: 1985-09-20
Abstract
No abstract record available.
Inventors
- 👤 Robert A D Schwartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:01
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/28; G02B27/281; F; F21; F21V; F21V3/00; F21V9/00; F21V9/14; F21Y; F21Y2103/00; F21Y2113/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
A CELLING PANEL FOR REDUCING UNDERSIRABLE REFLECTION OF ILLUMINATING LIGHT TO AN OBSERVER FROM AN AREA BEING ILLUMINATED COMPRISING POLARIZED MEANS FOR INTERCEPTING THE ILLUMINATING LIGHT BEFORE IT REACHES SAID AREA, SAID POLARIZING MEANS TRANSMITTING SAID INTERCEPTED LIGHT AS POLARIZED LIGHT HAVING A MAXIMUM PERCENTAGE OF POLARIZATION AT IN INCIDENCE ANGLE CORRESPONDING TO BREWSTER''S ANGLE FOR SAID POLARIZING MEANS AND LESSER PRECENTAGES OF POLARIZATION AT ANGLES OTHER THAN BREWESTER''S ANGLE, AND A LIGHT REFRACTIVE PRISMATIC SHEET MEANS DISPOSED TO INTERCEPT SAID POLARIZED LIGHT, SUBSTANTIALLY THE ENTIRE INCIDENT SURFACE OF SAID PRASMATIC SHEET MEANS HAVING A CONTINUALLY CHANGING ANGULAR RELATIONSHIP WITH RESPECT TO THE OPPOSITE SURFACE, SAID LIGHT REFRACTIVE PRISMATIC SHEET MEANS REFRACTING LIGHT HAVING MAXIMUM PRECENTAGE OF POLARIZATION AT BREWSTER''S ANGLE OVER A RANGE OF EMERGENT ANGLES BETWEEN 25* AND 40* AT WHICH SAID AREA IS TO BE VIEWED, AND MEANS FOR MOUNTING SAID POLARIZING MEANS AND SAID LIGHT REFRACTIVE PRISMATIC SHEET MEANS TO A CEILING STRUCTURES HAVING A SOURCE OF ILLUMINATING LIGHTS.
Claim 2
Dependent Claim
163 words
A CELLING PANEL FOR REDUCING UNDERSIRABLE REFLECTION OF ILLUMINATING LIGHT TO AN OBSERVER FROM AN AREA BEING ILLUMINATED COMPRISING POLARIZED MEANS FOR INTERCEPTING THE ILLUMINATING LIGHT BEFORE IT REACHES SAID AREA, SAID POLARIZING MEANS TRANSMITTING SAID INTERCEPTED LIGHT AS POLARIZED LIGHT HAVING A MAXIMUM PERCENTAGE OF POLARIZATION AT IN INCIDENCE ANGLE CORRESPONDING TO BREWSTER''S ANGLE FOR SAID POLARIZING MEANS AND LESSER PRECENTAGES OF POLARIZATION AT ANGLES OTHER THAN BREWESTER''S ANGLE, AND A LIGHT REFRACTIVE PRISMATIC SHEET MEANS DISPOSED TO INTERCEPT SAID POLARIZED LIGHT, SUBSTANTIALLY THE ENTIRE INCIDENT SURFACE OF SAID PRASMATIC SHEET MEANS HAVING A CONTINUALLY CHANGING ANGULAR RELATIONSHIP WITH RESPECT TO THE OPPOSITE SURFACE, SAID LIGHT REFRACTIVE PRISMATIC SHEET MEANS REFRACTING LIGHT HAVING MAXIMUM PRECENTAGE OF POLARIZATION AT BREWSTER''S ANGLE OVER A RANGE OF EMERGENT ANGLES BETWEEN 25* AND 40* AT WHICH SAID AREA IS TO BE VIEWED, AND MEANS FOR MOUNTING SAID POLARIZING MEANS AND SAID LIGHT REFRACTIVE PRISMATIC SHEET MEANS TO A CEILING STRUCTURES HAVING A SOURCE OF ILLUMINATING LIGHTS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |