CA1214805A - Method of rendering documents resistant to photocopying and anti-photocopying paper therefor - Google Patents

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

Info

Publication number
CA1214805A
CA1214805A CA000434210A CA434210A CA1214805A CA 1214805 A CA1214805 A CA 1214805A CA 000434210 A CA000434210 A CA 000434210A CA 434210 A CA434210 A CA 434210A CA 1214805 A CA1214805 A CA 1214805A
Authority
CA
Canada
Prior art keywords
light
document
millimicrons
wavelength
spectral response
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
CA000434210A
Other languages
English (en)
French (fr)
Inventor
Norman A. Gardner
Michael P. Voticky
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nocopi International Inc
Original Assignee
Nocopi International Inc
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 Nocopi International Inc filed Critical Nocopi International Inc
Application granted granted Critical
Publication of CA1214805A publication Critical patent/CA1214805A/en
Expired legal-status Critical Current

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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Paper (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Credit Cards Or The Like (AREA)
  • Cleaning In Electrography (AREA)
  • Printing Methods (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
  • Medicines Containing Plant Substances (AREA)
  • Saccharide Compounds (AREA)
CA000434210A 1983-03-16 1983-08-09 Method of rendering documents resistant to photocopying and anti-photocopying paper therefor Expired CA1214805A (en)

Applications Claiming Priority (2)

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
US475,791 1983-03-16

Publications (1)

Publication Number Publication Date
CA1214805A true CA1214805A (en) 1986-12-02

Family

ID=23889168

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000434210A Expired CA1214805A (en) 1983-03-16 1983-08-09 Method of rendering documents resistant to photocopying and anti-photocopying paper therefor

Country Status (12)

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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4951163B2 (ja) * 2008-07-03 2012-06-13 美津濃株式会社 スポーツ手袋

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
DK243283A (da) 1984-09-17
FI79671C (fi) 1990-02-12
EP0119344A1 (en) 1984-09-26
FI831891L (fi) 1984-09-17
DK243283D0 (da) 1983-05-30
ZA833659B (en) 1984-10-31
JPS59174870A (ja) 1984-10-03
AU560208B2 (en) 1987-04-02
NO171099B (no) 1992-10-19
NZ205794A (en) 1987-02-20
FI831891A0 (fi) 1983-05-26
NO831896L (no) 1984-09-17
ATE32274T1 (de) 1988-02-15
HK98688A (en) 1988-12-16
AU1811083A (en) 1984-09-20
FI79671B (fi) 1989-10-31
DE3375527D1 (en) 1988-03-03
JPH0513318B2 (no) 1993-02-22
EP0119344B1 (en) 1988-01-27
NO171099C (no) 1993-01-27

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Legal Events

Date Code Title Description
MKEX Expiry