Patent US5425978A successfully refreshed from Google Patents.
US5425978A
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US
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Substrates secure against unauthorized copying and processes for their preparation
Assignee: Bayer AG
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Filing: 1993-10-19
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Granted: 1995-06-20
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Expires: 2013-10-19
Abstract
Abstract Novel substrates bearing visible information applied thereto give indiscernible, for example illegible, photocopies when the information applied using colorant combinations of at least one emitting and at least one reflecting colorant whose shades upon viewing without fluorescence being perceived are similar or identical.
Inventors
- 👤 Horst Berneth
- 👤 Uwe Claussen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:17
CPC Classifications
B; B41; B41M; B41M3/00; B41M3/14; B41M3/144; G; G03; G03C; G03C5/00; G03C5/08; Y; Y10; Y10S; Y10S283/00; Y10S283/902; Y10S428/00; Y10S428/914; Y10S428/915; Y10S428/916; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24835; Y10T428/24893; Y10T428/24901; Y10T428/24934
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
91 words
Substrates bearing visible information applied thereto which are secure against unauthorized copying, whereas the information was applied using a colorant combination of at least one emitting and at least one reflecting colorant such that their shades upon viewing without fluorescence being perceived are similar or identical, the information having been applied by means of the colorant combination in such a manner that the various colour fields touch or are close to one another and wherein the absorption maxima of the colorants of a combination are not more than 30 nm apart.
Claim 2
Dependent Claim
91 words
Substrates bearing visible information applied thereto which are secure against unauthorized copying, whereas the information was applied using a colorant combination of at least one emitting and at least one reflecting colorant such that their shades upon viewing without fluorescence being perceived are similar or identical, the information having been applied by means of the colorant combination in such a manner that the various colour fields touch or are close to one another and wherein the absorption maxima of the colorants of a combination are not more than 30 nm apart.
Claim 3
Dependent Claim
13 words
Substrates according to claim 1, whereon more than one reflection colorant is used.
Claim 4
Dependent Claim
8 words
Substrates according to claim 1, consisting of paper.
Claim 5
Dependent Claim
23 words
Substrates according to claim 3, wherein the reflection colorant is applied by direct coloration and the emission colorant is applied in microencapsulated form.
Claim 6
Dependent Claim
14 words
Substrates according to claim 1, whereon the information is applied by writing or printing.
Claim 7
Dependent Claim
19 words
Substrates according to claim 1, whereon the colorants are applied as pigments or coloured plastic powders or polymer dispersions.
Claim 8
Dependent Claim
16 words
Substrates according to claim 1, whereon the absorption maxima are not more than 20 nm apart.
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) | 1998-06-19 | 1998-12-19 | 1999-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-06-19 | 2002-12-19 | 2003-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-06-19 | 2006-12-19 | 2007-06-20 | $7700.00 | Window Closed / Lapsed |