FR2422507A1 - Forming coloured inscription on paper - using a flat electrode carrying a moist sheet of paper contg. a pH sensitive developer, and a pointed inscription electrode - Google Patents

Forming coloured inscription on paper - using a flat electrode carrying a moist sheet of paper contg. a pH sensitive developer, and a pointed inscription electrode

Info

Publication number
FR2422507A1
FR2422507A1 FR7810766A FR7810766A FR2422507A1 FR 2422507 A1 FR2422507 A1 FR 2422507A1 FR 7810766 A FR7810766 A FR 7810766A FR 7810766 A FR7810766 A FR 7810766A FR 2422507 A1 FR2422507 A1 FR 2422507A1
Authority
FR
France
Prior art keywords
paper
inscription
pointed
electrode
colour
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.)
Granted
Application number
FR7810766A
Other languages
French (fr)
Other versions
FR2422507B1 (en
Inventor
Daniel Le Fur
Max Goldman
Joseph Dussaud
Pierre Girard
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.)
Electricite de France SA
Original Assignee
Electricite de France SA
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 Electricite de France SA filed Critical Electricite de France SA
Priority to FR7810766A priority Critical patent/FR2422507A1/en
Publication of FR2422507A1 publication Critical patent/FR2422507A1/en
Application granted granted Critical
Publication of FR2422507B1 publication Critical patent/FR2422507B1/fr
Granted 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
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/20—Duplicating or marking methods; Sheet materials for use therein using electric current

Abstract

Prodn. of a coloured inscription on paper comprises applying a potential difference between a flat electrode carrying a moist sheet of paper impregnated with a pH-sensitive developer, (e.g. phenol-phthalein), and a pointed electrode applied to the other side of the paper to cause a displacement of charge. The polarity determines the colour of the inscription which is formed in the surface of the paper facing the pointed positioned and controlled during the inscription such that a current of >5 microamperes is passed for >0.1 microseconds. The developer can be chosen such that it gives one colour above one pH and another colour below another pH, so that two-colour images can be formed. Images can be formed at relatively low potential differences (e.g. 10-50 volts). Recording is very rapid. In a pref. embodiment, the pointed electrode consists of a number of pointed electrodes in the form of a matrix in contact with the paper, so that by selective application of a potential difference to a combination of the electrodes, various characters can be recorded.
FR7810766A 1978-04-12 1978-04-12 Forming coloured inscription on paper - using a flat electrode carrying a moist sheet of paper contg. a pH sensitive developer, and a pointed inscription electrode Granted FR2422507A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7810766A FR2422507A1 (en) 1978-04-12 1978-04-12 Forming coloured inscription on paper - using a flat electrode carrying a moist sheet of paper contg. a pH sensitive developer, and a pointed inscription electrode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7810766A FR2422507A1 (en) 1978-04-12 1978-04-12 Forming coloured inscription on paper - using a flat electrode carrying a moist sheet of paper contg. a pH sensitive developer, and a pointed inscription electrode

Publications (2)

Publication Number Publication Date
FR2422507A1 true FR2422507A1 (en) 1979-11-09
FR2422507B1 FR2422507B1 (en) 1983-05-06

Family

ID=9207018

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7810766A Granted FR2422507A1 (en) 1978-04-12 1978-04-12 Forming coloured inscription on paper - using a flat electrode carrying a moist sheet of paper contg. a pH sensitive developer, and a pointed inscription electrode

Country Status (1)

Country Link
FR (1) FR2422507A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0058855A2 (en) * 1981-02-24 1982-09-01 International Business Machines Corporation Electrolytic printing method and apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE817821C (en) * 1948-12-31 1951-10-22 Siemens & Halske A G Writing device for registering measuring devices

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE817821C (en) * 1948-12-31 1951-10-22 Siemens & Halske A G Writing device for registering measuring devices

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0058855A2 (en) * 1981-02-24 1982-09-01 International Business Machines Corporation Electrolytic printing method and apparatus
EP0058855A3 (en) * 1981-02-24 1983-03-30 International Business Machines Corporation Electrolytic printing method and apparatus

Also Published As

Publication number Publication date
FR2422507B1 (en) 1983-05-06

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