IL99930A0 - Low contrast color combination for preventing copying via color photocopying - Google Patents
Low contrast color combination for preventing copying via color photocopyingInfo
- 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
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)
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)
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 |
-
1991
- 1991-11-01 IL IL99930A patent/IL99930A0/en unknown
-
1992
- 1992-10-26 CA CA002081437A patent/CA2081437A1/en not_active Abandoned
- 1992-10-29 EP EP92118496A patent/EP0539974A1/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
CA2081437A1 (en) | 1993-05-02 |
EP0539974A1 (en) | 1993-05-05 |
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