US3851950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projection screen
Assignee: Kalvar Corp
•
Filing: 1973-06-18
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Granted: 1974-12-03
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Expires: 1993-06-18
Abstract
Abstract A front projection screen formed of an aluminum member having a reflecting surface which is etched and anodized to provide random non-directional surface irregularities thereon. The reflecting surface may be provided with a concave spherical configuration. In one embodiment, the reflecting surface has a reading line thereon and the entire screen may be pivoted to align the reading line with a line of printed matter projected on the screen.
Inventors
- 👤 W Christoffersen
- 👤 J Keely
- 👤 C Koppa
- 👤 L Becker
- 👤 W Andres
- 👤 L Quanrud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:39
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/60
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
88 words
A front projection screen assembly which compriseS: an aluminum or aluminum alloy member having a reflecting surface provided with random non-directional surface irregularities formed by the etching of a smooth, bright surface which is free of surface defects; and means for supporting said aluminum member including pivot means engaging said aluminum member for preventing a translation of said aluminum member with respect to said supporting means in at least one direction while allowing said aluminum member to pivot with respect to said supporting means about said pivot means.
Claim 2
Dependent Claim
88 words
A front projection screen assembly which compriseS: an aluminum or aluminum alloy member having a reflecting surface provided with random non-directional surface irregularities formed by the etching of a smooth, bright surface which is free of surface defects; and means for supporting said aluminum member including pivot means engaging said aluminum member for preventing a translation of said aluminum member with respect to said supporting means in at least one direction while allowing said aluminum member to pivot with respect to said supporting means about said pivot means.
Claim 3
Dependent Claim
14 words
The projection screen assembly of claim 1 wherein said pivot means comprises a peg.
Claim 4
Dependent Claim
30 words
The projection screen assembly of claim 2 wherein said aluminum member comprises flange means extending from said reflecting surface, said flange means being provided with means for engaging said peg.
Claim 5
Dependent Claim
35 words
The projection screen assembly of claim 3 wherein said supporting means further comprises means for frictionally engaging said flange means for resisting a change in relative position between said aluminum member and said supporting means.
Claim 6
Dependent Claim
17 words
The projection screen assembly of claim 4 wherein said reflecting surface is provided with a reading line.
Claim 7
Dependent Claim
33 words
The projection screen assembly of claim 1 wherein said supporting means comprises means frictionally engaging said projection screen for resisting a change in relative position between said projection screen and said supporting means.
Claim 8
Dependent Claim
49 words
The projection screen assembly of claim 6 further comprising peg means extending from said supporting means and engaging said projection screen with respect to said supporting means in at least one direction while allowing said projection screen to pivot with respect to said supporting means about said peg means.
Claim 9
Dependent Claim
19 words
The projection screen assembly of claim 7 wherein said projection screen reflecting surface is provided with a reading line.
Claim 10
Dependent Claim
40 words
The projection screen assembly of claim 8 wherein said reflecting surface has a concave spherical configuration, the radius of curvature of said reflecting surface being approximately twice the desired distance between the projection screen and film to be projected thereon.
Claim 11
Dependent Claim
52 words
A front projection screen which comprises: an aluminum or aluminum alloy member having a reflecting surface provided with random non-directional surface irregularities formed by the etching of a smooth, bright surface which is free of surface defects, said reflecting surface having a concave spherical configuration and being provided with a reading line.
Claim 12
Dependent Claim
52 words
A front projection screen which comprises: an aluminum or aluminum alloy member having a reflecting surface provided with random non-directional surface irregularities formed by the etching of a smooth, bright surface which is free of surface defects, said reflecting surface having a concave spherical configuration and being provided with a reading line.
Claim 13
Dependent Claim
61 words
In a front projection screen assembly of the type having a projection screen including an aluminum or aluminum alloy reflecting surface and having means for supporting the projection screen, the improvement which comprises said aluminum projection screen reflecting surface being provided with random non-directional surface irregularities formed by the etching of a smooth, bright surface which is free of surface defects.
Claim 14
Dependent Claim
61 words
In a front projection screen assembly of the type having a projection screen including an aluminum or aluminum alloy reflecting surface and having means for supporting the projection screen, the improvement which comprises said aluminum projection screen reflecting surface being provided with random non-directional surface irregularities formed by the etching of a smooth, bright surface which is free of surface defects.
Claim 15
Dependent Claim
54 words
The projection screen assembly of claim 11 wherein said supporting means comprises pivot means engaging said projection screen for preventing a translation of said projection screen with respect to said supporting means in at least one direction while allowing said projection screen to pivot with respect to said supporting means about said pivot means.
Claim 16
Dependent Claim
38 words
The projection screen assembly of claim 12 wherein said pivot means comprises a peg and said projection screen comprises a flange means extending from said reflecting surface, said flange means being provided with means for engaging said peg.
Claim 17
Dependent Claim
50 words
In a front projection screen of the type having an aluminum or aluminum alloy projection screen reflecting surface, the improvement which comprises said aluminum projection screen reflecting surface being provided with random non-directional surface irregularities formed by the etching of a smooth, bright surface which is free of surface defects.
Claim 18
Dependent Claim
50 words
In a front projection screen of the type having an aluminum or aluminum alloy projection screen reflecting surface, the improvement which comprises said aluminum projection screen reflecting surface being provided with random non-directional surface irregularities formed by the etching of a smooth, bright surface which is free of surface defects.
Claim 19
Dependent Claim
12 words
The projection screen of claim 14 wherein said reflecting surface is anodized.
Claim 20
Dependent Claim
22 words
THe projection screen of claim 15 wherein said reflecting surface has a concave spherical configuration and is provided with a reading line.
Claim 21
Dependent Claim
32 words
The projection screen of claim 16 wherein the radius of curvature of said reflecting surface is approximately twice the desired distance between the projection screen and the film to be projected thereon.
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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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |