Patent US4206969A successfully refreshed from Google Patents.
US4206969A
Expired / Lapsed
US
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Directional front projection screen
Assignee: 3M Co
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Filing: 1979-04-11
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Granted: 1980-06-10
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Expires: 1999-04-11
Abstract
Abstract A high gain, front projection screen with controlled light distribution, comprising a translucent sheet containing light diffusing particles, having a matte-finished front surface and an incremental reflector rear surface.
Inventors
- 👤 Sanford Cobb
- 👤 Terrence M. Conder
- 👤 Dennis F. Vanderwerf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:35
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/60; G03B21/602
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
58 words
A front projection screen comprising, a sheet incorporating a translucent layer of light diffusing particles, said sheet having first and second major surfaces, said first surface having a matte surface finish for reducing specular reflection from said first surface, said second surface configured as an incremental specular reflector for directing reflected light to at least one viewing zone.
Claim 2
Dependent Claim
58 words
A front projection screen comprising, a sheet incorporating a translucent layer of light diffusing particles, said sheet having first and second major surfaces, said first surface having a matte surface finish for reducing specular reflection from said first surface, said second surface configured as an incremental specular reflector for directing reflected light to at least one viewing zone.
Claim 3
Dependent Claim
27 words
The front projection screen of claim 1 wherein said incremental reflector comprises a linear array of inclined facets for directing light to at least one viewing zone.
Claim 4
Dependent Claim
21 words
The front projection screen of claim 2 wherein said facets are inclined to redirect projected light toward a single viewing zone.
Claim 5
Dependent Claim
54 words
The front projection screen of claim 2 wherein said facets are arranged in a plurality of clusters, each of said clusters contains a defined number of adjacent facets, each facet within a cluster is inclined to redirect light toward specific viewing zones, to achieve a desired light distribution in conjunction with the diffusing layer.
Claim 6
Dependent Claim
25 words
The front projection screen of claim 1 or 2 further includng an adhesive located on said rear surface for mounting said screen on a substrate.
References Cited (Backward Citations)
US3612650A
Cited
US3726583A
Cited
US3712707A
Cited
US3811750A
Cited
US3844644A
Cited
US3964822A
Cited
US3893748A
Cited
US4089587A
Cited
US4068922A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-06-10 | 1983-12-10 | 1984-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-10 | 1987-12-10 | 1988-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-10 | 1991-12-10 | 1992-06-10 | $7700.00 | Window Closed / Lapsed |