IL99930A0 - Low contrast color combination for preventing copying via color photocopying - Google Patents

Low contrast color combination for preventing copying via color photocopying

Info

Publication number
IL99930A0
IL99930A0 IL99930A IL9993091A IL99930A0 IL 99930 A0 IL99930 A0 IL 99930A0 IL 99930 A IL99930 A IL 99930A IL 9993091 A IL9993091 A IL 9993091A IL 99930 A0 IL99930 A0 IL 99930A0
Authority
IL
Israel
Prior art keywords
low contrast
color
photocopying
preventing copying
copying via
Prior art date
Application number
IL99930A
Original Assignee
Egged Israel Transport Coopera
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
Application filed by Egged Israel Transport Coopera filed Critical Egged Israel Transport Coopera
Priority to IL99930A priority Critical patent/IL99930A0/en
Publication of IL99930A0 publication Critical patent/IL99930A0/en
Priority to CA002081437A priority patent/CA2081437A1/en
Priority to EP92118496A priority patent/EP0539974A1/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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Credit Cards Or The Like (AREA)
  • Printing Methods (AREA)
IL99930A 1991-11-01 1991-11-01 Low contrast color combination for preventing copying via color photocopying IL99930A0 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
IL99930A IL99930A0 (en) 1991-11-01 1991-11-01 Low contrast color combination for preventing copying via color photocopying
CA002081437A CA2081437A1 (en) 1991-11-01 1992-10-26 Method for preventing color copying of documents
EP92118496A EP0539974A1 (en) 1991-11-01 1992-10-29 Method for preventing color copying of documents

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IL99930A IL99930A0 (en) 1991-11-01 1991-11-01 Low contrast color combination for preventing copying via color photocopying

Publications (1)

Publication Number Publication Date
IL99930A0 true IL99930A0 (en) 1992-08-18

Family

ID=11063028

Family Applications (1)

Application Number Title Priority Date Filing Date
IL99930A IL99930A0 (en) 1991-11-01 1991-11-01 Low contrast color combination for preventing copying via color photocopying

Country Status (3)

Country Link
EP (1) EP0539974A1 (en)
CA (1) CA2081437A1 (en)
IL (1) IL99930A0 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3713861A (en) * 1969-12-04 1973-01-30 Xerox Corp Inhibitor device
US4118122A (en) * 1977-02-07 1978-10-03 Xerox Corporation Method of rendering objects uncopyable by photocopy processes
US4325981A (en) * 1978-03-07 1982-04-20 Toppan Printing Co., Ltd. Method of preventing color accurate reproductions using color photocopiers and the like
US4281921A (en) * 1979-09-17 1981-08-04 Auken John A Van Plural color anti-copying systems for xerographic and electrostatic copying machines
GB2139955B (en) * 1983-05-20 1987-03-04 Gen Electric Plc Preventing unauthorised copying
DE3938603A1 (en) * 1989-11-21 1991-05-23 Jung Bayropa Gmbh METHOD FOR DETECTING COPIES

Also Published As

Publication number Publication date
CA2081437A1 (en) 1993-05-02
EP0539974A1 (en) 1993-05-05

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