FI884161A - DOCUMENT, FOERFARANDE FOER FOERHINDRANDE AV FOTOKOPIERING AV DOKUMENTET OCH FOER FOTOKOPIERING OLAEMPLIGT PAPPER. - Google Patents

DOCUMENT, FOERFARANDE FOER FOERHINDRANDE AV FOTOKOPIERING AV DOKUMENTET OCH FOER FOTOKOPIERING OLAEMPLIGT PAPPER. Download PDF

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Publication number
FI884161A
FI884161A FI884161A FI884161A FI884161A FI 884161 A FI884161 A FI 884161A FI 884161 A FI884161 A FI 884161A FI 884161 A FI884161 A FI 884161A FI 884161 A FI884161 A FI 884161A
Authority
FI
Finland
Prior art keywords
fotokopiering
document
foer
olaempligt
dokumentet
Prior art date
Application number
FI884161A
Other languages
Finnish (fi)
Other versions
FI80638B (en
FI884161A0 (en
FI80638C (en
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
Priority claimed from FI831891A external-priority patent/FI79671C/en
Application filed by Norman A Gardner, Michael P Voticky filed Critical Norman A Gardner
Publication of FI884161A publication Critical patent/FI884161A/en
Publication of FI884161A0 publication Critical patent/FI884161A0/en
Publication of FI80638B publication Critical patent/FI80638B/en
Application granted granted Critical
Publication of FI80638C publication Critical patent/FI80638C/en

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Abstract

The invention relates to a document, to a method for preventing photocopying of documents and to a paper unsuitable for photocopying. The invention is characterized in that at least some of the information in the document is located on a section of its obverse and this section has a sufficiently low spectral sensitivity F, so that it cannot be legibly photocopied. This section of the document is capable of transmitting visible light from the reverse to the obverse in order to produce a sufficient contrast between the relatively non- transparent information and the permeated light in order to ensure that the information is normally legible. <IMAGE>
FI884161A 1983-03-16 1988-09-09 DOCUMENT, FOERFARANDE FOER FOERHINDRANDE AV FOTOKOPIERING AV DOKUMENTET OCH FOER FOTOKOPIERING OLAEMPLIGT PAPPER. FI80638C (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US47579183 1983-03-16
US06/475,791 US4632429A (en) 1981-05-25 1983-03-16 Method of rendering documents resistant to photocopying and anti-copying paper therefor
FI831891A FI79671C (en) 1983-03-16 1983-05-26 DOCUMENT, FOERFARANDE FOER FOERHINDRANDE AV LJUSKOPIERING AV DOKUMENT OCH FOER LJUSKOPIERING OTILLAEMPLIGT PAPPER.
FI831891 1983-05-26

Publications (4)

Publication Number Publication Date
FI884161A true FI884161A (en) 1988-09-09
FI884161A0 FI884161A0 (en) 1988-09-09
FI80638B FI80638B (en) 1990-03-30
FI80638C FI80638C (en) 1990-07-10

Family

ID=26157456

Family Applications (1)

Application Number Title Priority Date Filing Date
FI884161A FI80638C (en) 1983-03-16 1988-09-09 DOCUMENT, FOERFARANDE FOER FOERHINDRANDE AV FOTOKOPIERING AV DOKUMENTET OCH FOER FOTOKOPIERING OLAEMPLIGT PAPPER.

Country Status (1)

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FI (1) FI80638C (en)

Also Published As

Publication number Publication date
FI80638B (en) 1990-03-30
FI884161A0 (en) 1988-09-09
FI80638C (en) 1990-07-10

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Legal Events

Date Code Title Description
MM Patent lapsed

Owner name: GARDNER, NORMAN A.

Owner name: VOTICKY, MICHAEL P.