Thermographic printing method

Details Thermographic printing method Thermographic printing method

1976-02-06

1977-04-12

Coughenour, Clyde I.

Chemistry: electrical and wave energy

Processes and products

101470, 346165, 346 76R, G01D 1506, G01D 1510

Patent

active

040173666

ABSTRACT:
A method of printing on thermographic paper according to which the heat for causing the imaging color change in the thermographic coating is generated by means of current in a portion of the coating dampened by a thin film of a conductive salt solution which is dispensed on the thermographic coating. The current is generated by a printing head having spaced electrodes in contact with the dampened portion of the coating. The conductive salt solution may be deposited on the thermographic coating in liquid film form, combined with a thermographic material to form a conductive coating for printing in the dry state, or mixed with the thermographic material in liquid form and dispensed on plain paper in a thin film in the path of the writing head.

REFERENCES:
patent: 56988 (1866-08-01), Park
patent: 706743 (1902-08-01), Fessenden
patent: 2181533 (1939-11-01), Kline et al.
patent: 2316340 (1943-04-01), Kohn
patent: 2786807 (1957-03-01), Schwartz
patent: 3113910 (1963-12-01), Hepher
patent: 3158506 (1964-11-01), Ellison
patent: 3623122 (1971-11-01), Fotland

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