Patent US5087507A successfully refreshed from Google Patents.
US5087507A
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Method of rendering a document or portion of it resistant to photocopying
Assignee: Lipatec Etablissement
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Filing: 1988-11-08
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Granted: 1992-02-11
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Expires: 2008-11-08
Abstract
Abstract An article with at least a portion carrying symbols representing information to be protected against photocopying is formed by a carrier, a continuous layer covering the portion of the carrier and forming a background thereon, and a mainly discontinuous layer applied on the continuous layer and forming the symbols against the background. One of the layers is an iridescent layer of a color that copies dark and the other of the layers has a dark color. Thus photocopying gives an image without distinction between the symbols and the background.
Inventors
- 👤 Paul Heinzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:56
CPC Classifications
B; B42; B42D; B42D25/00; B42D25/40; B42D25/45; B42D25/30; B42D25/36; B42D25/378; B41; B41M; B41M3/00; B41M3/14; B41M3/144; B42D25/20; B42D25/29; B42D25/465; B42D25/47; G; G03; G03C; G03C5/00; G03C5/08; G03G; G03G21/00; G03G21/04; G03G21/043; Y; Y10; Y10S; Y10S283/00; Y10S283/902; Y10S428/00; Y10S428/916; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24851; Y10T428/24868
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
107 words
A method of preparing a document consisting of a sheet at least a portion of which carries alphanumeric or graphical information and resistant to photocopying, the method comprising the steps of: applying a continuous layer of a color that copies black directly to the portion of the sheet; applying to the portion of the sheet directly over the layer of color that copies black a continuous layer of an iridescent substance; and applying to the sheet directly over the iridescent-substance layer a layer forming the information against the continuous layer and having a dark color that also copies black, whereby photocopying gives a black copy without information.
Claim 2
Independent Claim
107 words
A method of preparing a document consisting of a sheet at least a portion of which carries alphanumeric or graphical information and resistant to photocopying, the method comprising the steps of: applying a continuous layer of a color that copies black directly to the portion of the sheet; applying to the portion of the sheet directly over the layer of color that copies black a continuous layer of an iridescent substance; and applying to the sheet directly over the iridescent-substance layer a layer forming the information against the continuous layer and having a dark color that also copies black, whereby photocopying gives a black copy without information.
Claim 3
Dependent Claim
96 words
An article with at least a portion carrying information to be protected against photocopying, the article consisting essentially of: a sheet; a continuous layer of a color that copies black directly covering the portion of the sheet; a continuous layer covering the portion of the sheet directly over the layer of the color that copies black and constituted as an iridescent layer; and a layer applied directly on the continuous iridescent layer, forming the information against the continuous layer, and having a dark color that also copies black, whereby photocopying gives a black copy without information.
Claim 4
Dependent Claim
96 words
An article with at least a portion carrying information to be protected against photocopying, the article consisting essentially of: a sheet; a continuous layer of a color that copies black directly covering the portion of the sheet; a continuous layer covering the portion of the sheet directly over the layer of the color that copies black and constituted as an iridescent layer; and a layer applied directly on the continuous iridescent layer, forming the information against the continuous layer, and having a dark color that also copies black, whereby photocopying gives a black copy without information.
References Cited (Backward Citations)
US4118122A
Cited
FR2429292A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-02-10 | 1995-08-12 | 1996-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-10 | 1999-08-12 | 2000-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-10 | 2003-08-12 | 2004-02-11 | $7700.00 | Window Closed / Lapsed |