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US4456667A
Expired / Lapsed
US
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Tamperproof document and a process for producing the same
Assignee: Agfa Gevaert AG
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Filing: 1982-07-26
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Granted: 1984-06-26
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Expires: 2002-07-26
Abstract
Abstract The tamperproof document consists of a photographic material as information carrier which is laminated on one or both sides with a transparent foil. The foil is attached to the surface of the information carrier by a layer of adhesive containing poly-1,2-alkyleneimine. The document is eminently saft against falsification.
Inventors
- 👤 Richarda Bochow
- 👤 Helmut Bergmann
- 👤 Siegfried Eikemeier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:43
CPC Classifications
B; B42; B42D; B42D25/00; B42D25/40; B42D25/405; B42D25/415; B42D25/42; B42D25/45; B42D25/455; B42D25/46; B42D25/465; B42D25/47; G; G03; G03C; G03C11/00; G03C11/08; B42D2033/04; B42D2033/14; B42D2033/28; B42D2033/30; B42D2035/08; Y; Y10; Y10S; Y10S283/00; Y10S283/904; Y10S428/00; Y10S428/916; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24843; Y10T428/24893
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
63 words
A tamperproof document consisting of an information carrier in the form of a photographic material covered with information and laminated on both sides to at least one transparent foil, characterised in that the photographic material has a gelatin-containing outer front-layer and the foil is bonded to the surface of the said gelatin-containing layer by means of an adhesive layer containing a poly-1,2 -alkyleneimine.
Claim 2
Dependent Claim
63 words
A tamperproof document consisting of an information carrier in the form of a photographic material covered with information and laminated on both sides to at least one transparent foil, characterised in that the photographic material has a gelatin-containing outer front-layer and the foil is bonded to the surface of the said gelatin-containing layer by means of an adhesive layer containing a poly-1,2 -alkyleneimine.
Claim 3
Dependent Claim
25 words
A document according to claim 1, characterised in that the adhesive layer contains from 0.05 to 0.5 g of a poly-1,2-alkyleneimine per m 2 .
Claim 4
Dependent Claim
21 words
A document according to claims 1 or 2, characterised in that the poly-1,2-alkyleneimine is a polyalkyleneimine modified with ketones or aldehydes.
Claim 5
Dependent Claim
16 words
A document according to claim 3, characterised in that the poly-1,2-alkyleneimine has been modified with formaldehyde.
Claim 6
Dependent Claim
15 words
A document according to claims 1 or 2, characterised in that the poly-1,2-alkyleneimine is polyethyleneimine.
Claim 7
Dependent Claim
26 words
A document according to claims 1 or 2, characterised in that, in addition to containing a poly-1,2-alkyleneimine, the adhesive layer contains a melamineformaldehyde or ureaformaldehyde resin.
Claim 8
Dependent Claim
35 words
The document according to claims 1 or 2, characterised in that the photographic material contains a layer support of paper with at least one layer containing a photographic image and optionally other photographic auxiliary layers.
Claim 9
Dependent Claim
21 words
A document according to claim 7, characterised in that the layer support is a paper coated on both sides with polyolefine.
Claim 10
Dependent Claim
48 words
A document according to claims 1 or 2, characterised in that the transparent foil consists of one or more thermoplasts from the group comprising polyethylene, cellulose esters, polyvinyl acetate, polypropylene, polystyrene, polyvinyl chloride, polyvinylidene chloride, polyvinylfluoride, polytetrahalogenethylene, polycarbonate based on bisphenol A, polyethylene terephthalate, polybutylene terephthalate and polyamide.
Claim 11
Dependent Claim
22 words
A document according to claim 9, characterised in that a composite foil formed from two or more of the foils is used.
Claim 12
Dependent Claim
22 words
A document according to claim 10, characterised in that the foil carrying the adhesive layer of the composite material consists of polyethylene.
Claim 13
Dependent Claim
90 words
A process for the production of tamperproof documents by laminating an information carrier consisting of a photographic material with foils on both sides, characterised in that the photographic material has a gelatin-containing outer front layer to which identifying features have been applied by imagewise exposure and photographic processing and a gelatin-containing backing layer and the foil is coated with an aqueous solution containing a poly-1,2-alkyleneimine, the layer is dried, and the foil is laminated with simultaneous application of heat and pressure to a surface of the said gelatin-containing outer front-layer.
Claim 14
Dependent Claim
90 words
A process for the production of tamperproof documents by laminating an information carrier consisting of a photographic material with foils on both sides, characterised in that the photographic material has a gelatin-containing outer front layer to which identifying features have been applied by imagewise exposure and photographic processing and a gelatin-containing backing layer and the foil is coated with an aqueous solution containing a poly-1,2-alkyleneimine, the layer is dried, and the foil is laminated with simultaneous application of heat and pressure to a surface of the said gelatin-containing outer front-layer.
Claim 15
Dependent Claim
50 words
A process according to claim 12, characterised in that the aqueous solution contains from 0.05 to 10% by weight of poly-1,2-alkyleneimine, from 0.01 to 2% by weight of an aldehyde or ketone and optionally from 0.01 to 1% by weight of a carboxylic acid, based on the carboxyl group content.
Claim 16
Dependent Claim
67 words
A tamperproof document consisting of an information carrier in the form of a photographic material covered with information and laminated on both sides to at least one transparent foil, characterised in that the photographic material has a gelatin-containing outer front-layer and a gelatin-containing backing layer and the foil is bonded to the surface of the said gelatin-containing layers by means of an adhesive layer containing a poly-1,2-alkyleneimine.
Claim 17
Dependent Claim
67 words
A tamperproof document consisting of an information carrier in the form of a photographic material covered with information and laminated on both sides to at least one transparent foil, characterised in that the photographic material has a gelatin-containing outer front-layer and a gelatin-containing backing layer and the foil is bonded to the surface of the said gelatin-containing layers by means of an adhesive layer containing a poly-1,2-alkyleneimine.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
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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) | 1987-06-26 | 1987-12-26 | 1988-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-26 | 1991-12-26 | 1992-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-26 | 1995-12-26 | 1996-06-26 | $7700.00 | Window Closed / Lapsed |