US3218924A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rear projection screen
Assignee: Individual
•
Filing: 1962-06-25
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Granted: 1965-11-23
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Expires: 1982-06-25
Abstract
No abstract record available.
Inventors
- 👤 Wendell S Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:59
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/60; G03B21/62; G03B21/625
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
166 words
A REAR PROJECTION SCREEN HAVING A FIRST SIDE ONTO WHICH AN IMAGE IS PROJECTED AND SECOND SIDE AT WHICH SAID IMAGE IS VIEWED, SAID SCREEN COMPRISING TWO INTERCONNECTED SHEET-LIKE ELEMENTS, ONE OF SAID SHEET-LIKE ELEMENTS BEING FORMED OF TRANSPARENT MATERIAL HAVING A LARGE NUMBER OF LIGHT GUIDES FORMED INTEGRALLY ON ONE SURFACE THEREOF, SAID LIGHT GUIDES COMPRISING LUGS HAVING INWARDLY REFLECTIVE SURFACES WHEN REFLECT INWARDLY LIGHT PASSING THROUGH THE GUIDES AND WHICH TAPER IN ADVANCING FROM SAID FIRST SIDE OF THE SCREEN TOWARD SAID SECOND SIDE TO FORM RELATIVELY LARGE CROSS-SECTION INLET ENDS OF THE GUIDES NEAR SAID FIRST SIDE OF THE SCREEN AND SMALLER CROSS-SECTION OUTLET ENDS NEAR SAID SECOND SIDE OF THE SCREEN, SAID LUGS HAVING COATINGS OR HIGHLY REFLECTIVE MATERIAL FORMING PORTIONS OF SAID INWARDLY REFLECTIVE SURFACES AND EXTENDING ABOUT ONLY THE PORTIONS OF THE LUGS ADJACENT SAID OUTLET ENDS THEREOF, SAID SECOND SHEET-LIKE ELEMET CONTAINING OPENINGS OF A NUMBER, SIZE, CONFIGURATION AND SPACING CORRESPONDING TO SAID LUGS AND RECEIVING SAID LUGS IN
Claim 2
Dependent Claim
166 words
A REAR PROJECTION SCREEN HAVING A FIRST SIDE ONTO WHICH AN IMAGE IS PROJECTED AND SECOND SIDE AT WHICH SAID IMAGE IS VIEWED, SAID SCREEN COMPRISING TWO INTERCONNECTED SHEET-LIKE ELEMENTS, ONE OF SAID SHEET-LIKE ELEMENTS BEING FORMED OF TRANSPARENT MATERIAL HAVING A LARGE NUMBER OF LIGHT GUIDES FORMED INTEGRALLY ON ONE SURFACE THEREOF, SAID LIGHT GUIDES COMPRISING LUGS HAVING INWARDLY REFLECTIVE SURFACES WHEN REFLECT INWARDLY LIGHT PASSING THROUGH THE GUIDES AND WHICH TAPER IN ADVANCING FROM SAID FIRST SIDE OF THE SCREEN TOWARD SAID SECOND SIDE TO FORM RELATIVELY LARGE CROSS-SECTION INLET ENDS OF THE GUIDES NEAR SAID FIRST SIDE OF THE SCREEN AND SMALLER CROSS-SECTION OUTLET ENDS NEAR SAID SECOND SIDE OF THE SCREEN, SAID LUGS HAVING COATINGS OR HIGHLY REFLECTIVE MATERIAL FORMING PORTIONS OF SAID INWARDLY REFLECTIVE SURFACES AND EXTENDING ABOUT ONLY THE PORTIONS OF THE LUGS ADJACENT SAID OUTLET ENDS THEREOF, SAID SECOND SHEET-LIKE ELEMET CONTAINING OPENINGS OF A NUMBER, SIZE, CONFIGURATION AND SPACING CORRESPONDING TO SAID LUGS AND RECEIVING SAID LUGS IN
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) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |