Patent US3581416A successfully refreshed from Google Patents.
US3581416A
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Tamper proof laminations having silver image
Assignee: Polaroid Corp
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Filing: 1966-12-09
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Granted: 1971-06-01
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Expires: 1986-12-09
Abstract
Abstract Laminar structures comprising a photographic image in silver, the image-bearing surface of which is laminated to a transparent layer comprising a hydroxylated polymer via an intermediate layer consisting essentially of a mixture of polyvinyl alcohol and a methyl vinyl ether-maleic acid copolymer or a partial lower alkyl ester of such a copolymer.
Inventors
- 👤 Paul A Andrews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:26
CPC Classifications
B; B42; B42D; B42D25/00; B42D25/40; B42D25/405; B42D25/415; B42D25/42; G; G03; G03C; G03C11/00; G03C11/08; B01; B01D; B01D29/00; B01D29/01; B01D29/012; B01D29/03; B42D25/20; B42D25/23; B42D25/30; B42D25/309; B42D25/45; B42D25/46; B42D2033/04; B42D2033/14; B42D2033/30; B42D25/455
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
16 words
A laminar structure as defined in claim 1 wherein said transparent hydroxylated polymer is polyvinyl alcohol.
Claim 2
Dependent Claim
20 words
A laminar structure as defined in claim 1 wherein said transparent hydroxylated polymer is a molecularly oriented light-polarizing polyvinyl alcohol.
Claim 3
Dependent Claim
21 words
A laminar structure as defined in claim 1 wherein said transparent hydroxylated polymer is a partially hydrolyzed vinyl acetate-vinyl chloride copolymer.
Claim 4
Dependent Claim
17 words
A laminar structure as defined in claim 1 wherein said transparent hydroxylated polymer is hydrolyzed cellulose acetate.
Claim 5
Dependent Claim
43 words
A laminar structure as defined in claim 1 wherein said first transparent layer comprises a cellulose acetate butyrate support having a first subcoat comprising cellulose nitrate, a second subcoat comprising cellulose nitrate and hydrolyzed polyvinyl acetate, and a third subcoat comprising polyvinyl alcohol.
Claim 6
Dependent Claim
58 words
A laminar structure as defined in claim 1 wherein said first transparent layer comprises a vinyl acetate-vinyl chloride embossable film having a subcoat comprising a vinyl acetate-vinyl chloride copolymer having a vinyl acetate to vinyl chloride ratio of from about 7:3 to 1:1, the surface of said subcoat away from said embossable film being at least partially hydrolyzed.
Claim 7
Dependent Claim
13 words
A tamperproof identification card comprising a laminar structure as defined in claim 1.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |