BE764350A - PROCESS FOR FORMING INVISIBLE IMAGES AND SYSTEM FOR DEVELOPING THEM - Google Patents

PROCESS FOR FORMING INVISIBLE IMAGES AND SYSTEM FOR DEVELOPING THEM

Info

Publication number
BE764350A
BE764350A BE764350A BE764350A BE764350A BE 764350 A BE764350 A BE 764350A BE 764350 A BE764350 A BE 764350A BE 764350 A BE764350 A BE 764350A BE 764350 A BE764350 A BE 764350A
Authority
BE
Belgium
Prior art keywords
developing
invisible images
forming invisible
forming
images
Prior art date
Application number
BE764350A
Other languages
French (fr)
Inventor
R E Thomas
Original Assignee
Dick Co Ab
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 Dick Co Ab filed Critical Dick Co Ab
Publication of BE764350A publication Critical patent/BE764350A/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/001—Printing processes to produce particular kinds of printed work, e.g. patterns using chemical colour-formers or chemical reactions, e.g. leuco dyes or acids
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B3/00—Manually or mechanically operated teaching appliances working with questions and answers
    • G09B3/06—Manually or mechanically operated teaching appliances working with questions and answers of the multiple-choice answer type, i.e. where a given question is provided with a series of answers and a choice has to be made
    • G09B3/08—Manually or mechanically operated teaching appliances working with questions and answers of the multiple-choice answer type, i.e. where a given question is provided with a series of answers and a choice has to be made of chart form
    • G09B3/085—Manually or mechanically operated teaching appliances working with questions and answers of the multiple-choice answer type, i.e. where a given question is provided with a series of answers and a choice has to be made of chart form with invisibly printed correct answer; the answer being rendered visible by special optical means, e.g. filters; mirrors

Landscapes

  • Engineering & Computer Science (AREA)
  • Business, Economics & Management (AREA)
  • Physics & Mathematics (AREA)
  • Educational Administration (AREA)
  • Educational Technology (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Color Printing (AREA)
BE764350A 1970-03-16 1971-03-16 PROCESS FOR FORMING INVISIBLE IMAGES AND SYSTEM FOR DEVELOPING THEM BE764350A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US1995570A 1970-03-16 1970-03-16

Publications (1)

Publication Number Publication Date
BE764350A true BE764350A (en) 1971-08-16

Family

ID=21795979

Family Applications (1)

Application Number Title Priority Date Filing Date
BE764350A BE764350A (en) 1970-03-16 1971-03-16 PROCESS FOR FORMING INVISIBLE IMAGES AND SYSTEM FOR DEVELOPING THEM

Country Status (6)

Country Link
BE (1) BE764350A (en)
CA (1) CA940301A (en)
DE (1) DE2112380A1 (en)
FR (1) FR2084649A5 (en)
GB (1) GB1350930A (en)
NL (1) NL7103180A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0022760A1 (en) * 1979-02-16 1981-01-21 Amplikart S.P.R.L. Self corrector for multiple-choice questionnaire
US4272106A (en) 1979-10-10 1981-06-09 Minnesota Mining And Manufacturing Company Copy sheet
US5310627A (en) * 1992-12-15 1994-05-10 Minnesota Mining And Manufacturing Company Changing the color of yellow resist images by application of pH-sensitive dyes
EP2264110A1 (en) 2009-06-17 2010-12-22 Mondi Uncoated Fine & Kraft Paper GmbH Reactive ink for chromophoric illustration of surfaces
WO2010072388A2 (en) 2008-12-22 2010-07-01 Mondi Uncoated Fine & Kraft Paper Gmbh Method for the colour-imparting inscribing of surfaces
EP2199094A1 (en) 2008-12-22 2010-06-23 Mondi Uncoated Fine & Kraft Paper GmbH Method for chromophoric illustration of surfaces
EP2325018A1 (en) 2009-11-24 2011-05-25 Mondi Uncoated Fine & Kraft Paper GmbH Thermally sensitive recording material

Also Published As

Publication number Publication date
GB1350930A (en) 1974-04-24
NL7103180A (en) 1971-09-20
FR2084649A5 (en) 1971-12-17
DE2112380A1 (en) 1971-10-07
CA940301A (en) 1974-01-22

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