BE764350A - Procede pour former des images invisibles et systeme pour les developper - Google Patents
Procede pour former des images invisibles et systeme pour les developperInfo
- 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
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)
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 (fr) | 1971-08-16 |
Family
ID=21795979
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE764350A BE764350A (fr) | 1970-03-16 | 1971-03-16 | Procede pour former des images invisibles et systeme pour les developper |
Country Status (6)
Country | Link |
---|---|
BE (1) | BE764350A (de) |
CA (1) | CA940301A (de) |
DE (1) | DE2112380A1 (de) |
FR (1) | FR2084649A5 (de) |
GB (1) | GB1350930A (de) |
NL (1) | NL7103180A (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0022760A1 (de) * | 1979-02-16 | 1981-01-21 | Amplikart S.P.R.L. | Selbstkontrolle für Fragebogen mit Auswahlantworten |
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 (de) | 2009-06-17 | 2010-12-22 | Mondi Uncoated Fine & Kraft Paper GmbH | Reaktive Tinte zur farbgebenden Beschriftung von Oberflächen |
WO2010072388A2 (de) | 2008-12-22 | 2010-07-01 | Mondi Uncoated Fine & Kraft Paper Gmbh | Verfahren 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 |
EP2325018A1 (de) | 2009-11-24 | 2011-05-25 | Mondi Uncoated Fine & Kraft Paper GmbH | Thermisch sensibles Aufzeichnungsmaterial |
-
1971
- 1971-02-25 CA CA106,297A patent/CA940301A/en not_active Expired
- 1971-03-10 NL NL7103180A patent/NL7103180A/xx unknown
- 1971-03-15 DE DE19712112380 patent/DE2112380A1/de active Pending
- 1971-03-16 FR FR7109048A patent/FR2084649A5/fr not_active Expired
- 1971-03-16 BE BE764350A patent/BE764350A/xx unknown
- 1971-04-19 GB GB2403771A patent/GB1350930A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB1350930A (en) | 1974-04-24 |
NL7103180A (de) | 1971-09-20 |
FR2084649A5 (de) | 1971-12-17 |
DE2112380A1 (de) | 1971-10-07 |
CA940301A (en) | 1974-01-22 |
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