CA940301A - Concealed printing process and development system for same - Google Patents

Concealed printing process and development system for same

Info

Publication number
CA940301A
CA940301A CA106,297A CA106297A CA940301A CA 940301 A CA940301 A CA 940301A CA 106297 A CA106297 A CA 106297A CA 940301 A CA940301 A CA 940301A
Authority
CA
Canada
Prior art keywords
same
printing process
development system
concealed printing
concealed
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
CA106,297A
Other languages
English (en)
Inventor
Richard E. Thomas
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.)
AB Dick Co
Original Assignee
AB Dick Co
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 AB Dick Co filed Critical AB Dick Co
Application granted granted Critical
Publication of CA940301A publication Critical patent/CA940301A/en
Expired legal-status Critical Current

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)
CA106,297A 1970-03-16 1971-02-25 Concealed printing process and development system for same Expired CA940301A (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
CA940301A true CA940301A (en) 1974-01-22

Family

ID=21795979

Family Applications (1)

Application Number Title Priority Date Filing Date
CA106,297A Expired CA940301A (en) 1970-03-16 1971-02-25 Concealed printing process and development system for same

Country Status (6)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4272106A (en) 1979-10-10 1981-06-09 Minnesota Mining And Manufacturing Company Copy sheet

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0022760A1 (fr) * 1979-02-16 1981-01-21 Amplikart S.P.R.L. Auto-contrôle pour questionnaire à choix multiple
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 (de) 2009-06-17 2010-12-22 Mondi Uncoated Fine & Kraft Paper GmbH Reaktive Tinte zur farbgebenden Beschriftung von Oberflächen
EP2199094A1 (de) 2008-12-22 2010-06-23 Mondi Uncoated Fine & Kraft Paper GmbH Verfahren zur farbgebenden Beschriftung von Oberflächen
US20120038701A1 (en) 2008-12-22 2012-02-16 Thomas Schalkhammer Method for the colour-imparting inscribing of surfaces
EP2325018A1 (de) 2009-11-24 2011-05-25 Mondi Uncoated Fine & Kraft Paper GmbH Thermisch sensibles Aufzeichnungsmaterial

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4272106A (en) 1979-10-10 1981-06-09 Minnesota Mining And Manufacturing Company Copy sheet

Also Published As

Publication number Publication date
FR2084649A5 (enExample) 1971-12-17
GB1350930A (en) 1974-04-24
BE764350A (fr) 1971-08-16
NL7103180A (enExample) 1971-09-20
DE2112380A1 (de) 1971-10-07

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