US4694148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Access card
Assignee: MIDS MAGNETISCHE INFORMATIONS und DATEN SYSTEME GmbH
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Filing: 1985-07-05
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Granted: 1987-09-15
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Expires: 2005-07-05
Abstract
Abstract In an access card having coded material which comprises a plurality of markings which under infrared radiation appear on an infrared receiver, it is provided in accordance with the invention in order to prevent counterfeiting that a continuous and transparent plastic foil or film blank (4), at least on a portion of its surface, has a layer (4a) that is not transparent to visible light and is transparent to infrared light; together with a substrate (5), the blank embodies a laminate which on its inside carries a photosensitive layer (7) covered by a layer that is transparent to infrared light. The markings (21-23) appear as a negative or positive on the photosensitive layer (7) as the result of exposure of the plastic foil or film blank (4) to light.
Inventors
- 👤 Erwin Diekemper
- 👤 Dieter Kastrup
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:42
CPC Classifications
G; G07; G07F; G07F7/00; G07F7/08; G07F7/086; G06; G06K; G06K19/00; G06K19/06; G06K19/08; G06K19/10; G06K19/14; Y; Y10; Y10S; Y10S283/00; Y10S283/904
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
129 words
An access card with recorded coded data including markings which appear on a radiation receiver when exposed to radiation, comprising: a first and a second continuous and transparent plastic foil or film blank; a layer of material arranged between said blanks, said material being non-transparent for visible light and transparent for infrared light and disposed on at least a portion of one surface of said first blank; a layer of photosensitive material (7) carried on at least a portion of one surface of said second blank; said first and second blanks forming a laminate with said layer that is transparent to infrared light covering said photosensitive layer; and the markings (21-23) appearing as negative or positive images on said photosensitive layer upon existing said blanks to a marking light.
Claim 2
Dependent Claim
129 words
An access card with recorded coded data including markings which appear on a radiation receiver when exposed to radiation, comprising: a first and a second continuous and transparent plastic foil or film blank; a layer of material arranged between said blanks, said material being non-transparent for visible light and transparent for infrared light and disposed on at least a portion of one surface of said first blank; a layer of photosensitive material (7) carried on at least a portion of one surface of said second blank; said first and second blanks forming a laminate with said layer that is transparent to infrared light covering said photosensitive layer; and the markings (21-23) appearing as negative or positive images on said photosensitive layer upon existing said blanks to a marking light.
Claim 3
Dependent Claim
42 words
The access card of claim 1 wherein a mask (8) carries the markings (21-23) as positive or negative images; said mask being superimposed on one of said first and second blanks; said images being transferrable substantially without distortion to said second blank.
Claim 4
Dependent Claim
29 words
The access card of claim 1 wherein said blanks carry an antireflection coating whereby substantially distortion free reproduction of the markings (21-23) on said photosensitive layer (7) is achieved.
Claim 5
Dependent Claim
34 words
The access card of claims 1, 2 or 3 wherein the markings (21-23) are reproduced on a point-type emitter whereby the markings are transferrable in point form through said blanks to said photosensitive layer.
Claim 6
Dependent Claim
31 words
The access card of claims 1, 2 or 3 wherein said second blank forms a substrate (5); and a third blank covers the surface of said substrate opposite said photosensitive layer.
Claim 7
Dependent Claim
28 words
The access card of claim 4 wherein said second blank forms a substrate (5); and a third blank covers the surface of said substrate opposite said photosensitive layer.
Claim 8
Dependent Claim
32 words
The access card of claim 1 wherein the portion of said second blank covered by said photosensitive layer (7) corresponds to a selected portion (20) of the surface (18-20) of the blank.
Claim 9
Dependent Claim
28 words
The access card of claim 1 wherein the layer which is transparent to infrared light is permeable to radiation in the range between approximately 900 and 950 μm.
Claim 10
Dependent Claim
22 words
The access card of claim 1 wherein said photosensitive layer is markable with radiation in the ultraviolet range at approximately 400 μm.
Claim 11
Dependent Claim
27 words
The access card of claim 1 wherein said photosensitive layer is subjected to a temperature treatment at between 70° and 180° C. to fix the markings (21-23).
Claim 12
Dependent Claim
147 words
An access card for receiving coded data readable by a radiation receiver presented to one side of the card when a radiation source is presented to the other side of the card, comprising: a first continuous and transparent blank; a coating disposed on at least a portion of one surface of said first blank, said coating being non-transparent to visible light and transparent to infrared light; a second plastic blank; photosensitive material carried on at least a portion of one surface of said second blank in opposition to said coating, said photosensitive material being alterable upon exposure to a light source; and said first and second blanks forming a laminate with said coating superimposed over said photosensitive material; whereby the access card is encodable with data upon exposure to an encoding light source so as to alter said photosensitive material into distinct regions transparent to infrared light.
Claim 13
Dependent Claim
147 words
An access card for receiving coded data readable by a radiation receiver presented to one side of the card when a radiation source is presented to the other side of the card, comprising: a first continuous and transparent blank; a coating disposed on at least a portion of one surface of said first blank, said coating being non-transparent to visible light and transparent to infrared light; a second plastic blank; photosensitive material carried on at least a portion of one surface of said second blank in opposition to said coating, said photosensitive material being alterable upon exposure to a light source; and said first and second blanks forming a laminate with said coating superimposed over said photosensitive material; whereby the access card is encodable with data upon exposure to an encoding light source so as to alter said photosensitive material into distinct regions transparent to infrared light.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-09-14 | 1991-03-16 | 1991-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-14 | 1995-03-16 | 1995-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-14 | 1999-03-16 | 1999-09-15 | $7700.00 | Window Closed / Lapsed |