ZA833659B - Method of rendering documents resistant to photocopying and anti-copying paper and ink therefor - Google Patents

Method of rendering documents resistant to photocopying and anti-copying paper and ink therefor

Info

Publication number
ZA833659B
ZA833659B ZA833659A ZA833659A ZA833659B ZA 833659 B ZA833659 B ZA 833659B ZA 833659 A ZA833659 A ZA 833659A ZA 833659 A ZA833659 A ZA 833659A ZA 833659 B ZA833659 B ZA 833659B
Authority
ZA
South Africa
Prior art keywords
document
information
front face
photocopying
copying paper
Prior art date
Application number
ZA833659A
Inventor
Norman A Gardner
Michael P Voticky
Original Assignee
Norman A Gardner
Michael P Voticky
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US06/475,791 external-priority patent/US4632429A/en
Application filed by Norman A Gardner, Michael P Voticky filed Critical Norman A Gardner
Publication of ZA833659B publication Critical patent/ZA833659B/en

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/04—Preventing copies being made of an original
    • G03G21/043—Preventing copies being made of an original by using an original which is not reproducible or only reproducible with a different appearence, e.g. originals with a photochromic layer or a colour background

Abstract

A document has information appearing thereon, with at least a portion of the information being located on a front face of a portion of the document. The front face portion has a colour with a sufficiently low reflection spectral response to render the document portion substantially incapable of being photocopied in an information-readable manner. The document portion is capable of transmitting visible light from the rear face to the front face to cause sufficient contrast between the relatively non-translucent information and the transmitted light to enable the information to be read by a human eye viewing the front face of the document when visible light is transmitted through the document from the rear face to the front face.
ZA833659A 1983-03-16 1983-05-20 Method of rendering documents resistant to photocopying and anti-copying paper and ink therefor ZA833659B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/475,791 US4632429A (en) 1981-05-25 1983-03-16 Method of rendering documents resistant to photocopying and anti-copying paper therefor

Publications (1)

Publication Number Publication Date
ZA833659B true ZA833659B (en) 1984-10-31

Family

ID=23889168

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA833659A ZA833659B (en) 1983-03-16 1983-05-20 Method of rendering documents resistant to photocopying and anti-copying paper and ink therefor

Country Status (12)

Country Link
EP (1) EP0119344B1 (en)
JP (1) JPS59174870A (en)
AT (1) ATE32274T1 (en)
AU (1) AU560208B2 (en)
CA (1) CA1214805A (en)
DE (1) DE3375527D1 (en)
DK (1) DK243283A (en)
FI (1) FI79671C (en)
HK (1) HK98688A (en)
NO (1) NO171099C (en)
NZ (1) NZ205794A (en)
ZA (1) ZA833659B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4951163B2 (en) * 2008-07-03 2012-06-13 美津濃株式会社 Sports gloves

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3852088A (en) * 1972-03-20 1974-12-03 Ibm Security document system and method
US3887742A (en) * 1972-04-13 1975-06-03 Richard E Reinnagel Copy resistant documents
FR2247067A5 (en) * 1973-10-04 1975-05-02 Arjomari Prioux Non-photocopiable security document - allows markings to be read by eye but reflects uniform light when illuminated
JPS55100587A (en) * 1979-01-29 1980-07-31 Toppan Printing Co Ltd Image forming material
GB2096055B (en) * 1979-09-17 1985-02-27 Auken John A Van Anti-copying systems for copying machines

Also Published As

Publication number Publication date
FI79671C (en) 1990-02-12
ATE32274T1 (en) 1988-02-15
HK98688A (en) 1988-12-16
FI831891L (en) 1984-09-17
FI831891A0 (en) 1983-05-26
AU560208B2 (en) 1987-04-02
DK243283D0 (en) 1983-05-30
EP0119344B1 (en) 1988-01-27
NO171099B (en) 1992-10-19
DE3375527D1 (en) 1988-03-03
AU1811083A (en) 1984-09-20
CA1214805A (en) 1986-12-02
DK243283A (en) 1984-09-17
FI79671B (en) 1989-10-31
JPS59174870A (en) 1984-10-03
EP0119344A1 (en) 1984-09-26
JPH0513318B2 (en) 1993-02-22
NO831896L (en) 1984-09-17
NZ205794A (en) 1987-02-20
NO171099C (en) 1993-01-27

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