Method and apparatus for discriminating printings

Details Method and apparatus for discriminating printings Method and apparatus for discriminating printings

1994-04-26

1996-04-16

Allen, Stephone B.

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

250271, 428195, G01N 2100, B32B 300

Patent

active

055085202

ABSTRACT:
In a method and an apparatus for discriminating real securities from copies thereof produced by an electrophotographic copier using a toner, a heating member heated to a temperature above 50.degree. C. and below 250.degree. C. is brought into contact with a printing to see if an image on the printing changes or if any deposit is present on the heating member. Whether or not the image of the printing is formed by a toner whose major component is a thermoplastic resin, is determined on the basis of the result of the above decision.

REFERENCES:
patent: 4533244 (1985-08-01), Kaule et al.
patent: 5146087 (1992-09-01), Van Dusen
patent: 5151595 (1992-09-01), Filo
patent: 5312797 (1994-05-01), Takiguchi et al.
patent: 5397763 (1995-05-01), Fujimura et al.

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