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 PDFInfo
- 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
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- Credit Cards Or The Like (AREA)
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>
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)
Country | Link |
---|---|
FI (1) | FI80638C (en) |
-
1988
- 1988-09-09 FI FI884161A patent/FI80638C/en not_active IP Right Cessation
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. |