Patent US4309073A successfully refreshed from Google Patents.
US4309073A
Expired / Lapsed
US
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Translucent screen assembly
Assignee: Sanyo Electric Co Ltd
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Filing: 1980-01-07
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Granted: 1982-01-05
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Expires: 2000-01-07
Abstract
Abstract A screen assembly for use in projection type color television system includes a first layer of acrylic resin having a first surface formed with Fresnel lens and its second surface integrally formed with a second layer acrylic resin containing pigment for forming a diffuser.
Inventors
- 👤 Itsuro Nishimura
- 👤 Yoshimasa Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:21
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/60; G03B21/62; G03B21/625
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
161 words
A screen assembly comprising: (a) a first layer consisting essentially of a translucent resin, having a first surface formed with a Fresnel lens and a second surface on the opposite side of said first layer from said first surface thereof; (b) a second layer comprising a resin mixed with a diffusion means, said second layer having a first surface which is integrally formed on the second surface of said first layer, wherein said first layer is thicker than said second layer; (c) a third layer consisting essentially of a translucent resin, said third layer having a first surface which is integrally formed on a second surface of said second layer, said second surface of said second layer being on the opposite side of said second layer from said first surface thereof, and said third layer having a second surface on the opposite side of said third layer from said first surface thereof, said second surface of said third layer being polished.
Claim 2
Dependent Claim
161 words
A screen assembly comprising: (a) a first layer consisting essentially of a translucent resin, having a first surface formed with a Fresnel lens and a second surface on the opposite side of said first layer from said first surface thereof; (b) a second layer comprising a resin mixed with a diffusion means, said second layer having a first surface which is integrally formed on the second surface of said first layer, wherein said first layer is thicker than said second layer; (c) a third layer consisting essentially of a translucent resin, said third layer having a first surface which is integrally formed on a second surface of said second layer, said second surface of said second layer being on the opposite side of said second layer from said first surface thereof, and said third layer having a second surface on the opposite side of said third layer from said first surface thereof, said second surface of said third layer being polished.
Claim 3
Dependent Claim
29 words
A screen assembly as claimed in claim 1, wherein the ratio of the thickness of said first layer to the thickness of said second layer is 6 to 1.
Claim 4
Dependent Claim
15 words
A screen assembly as claimed in claim 1, wherein said diffusion means is a pigment.
Claim 5
Dependent Claim
18 words
A screen assembly as claimed in claim 3, wherein said pigment is consists essentially of SiO 2 .
Claim 6
Dependent Claim
23 words
A screen assembly as claimed in any one of claims 1, 2, 3 or 4, wherein said translucent resin is an acrylic resin.
References Cited (Backward Citations)
CA469403A
Cited
US3902787A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-04 | 1985-07-06 | 1986-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-04 | 1989-07-06 | 1990-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-04 | 1993-07-06 | 1994-01-05 | $7700.00 | Window Closed / Lapsed |