Method and apparatus for checking the authenticity of documents

Details Method and apparatus for checking the authenticity of documents Method and apparatus for checking the authenticity of documents

1986-09-19

1989-04-11

Pellinen, A. D.

Registers

Coded record sensors

Particular sensor structure

235482, 235492, 324 58A, 34082534, 283 70, 283 83, G01R 2704

Patent

active

048209120

ABSTRACT:
A method and an apparatus for checking the authenticity of documents, such as banknotes or credit-cards. The documents comprise a number of randomly distributed conductive fibres of which the distribution is scanned by microwaves and the response is transformed into a digital coded signal. A digital mark on the document, which is representative for the distribution of an individual document, is read off, transcoded, and compared with said coded signal for producing an approval signal. The use of a microwave scanning system in conjunction with documents having a random distribution of suitable fibres ensures a great repetitivity and security of the system.

REFERENCES:
patent: 4255652 (1981-03-01), Weber
patent: 4310591 (1982-01-01), Lee et al.
patent: 4584529 (1986-04-01), Aoyamo
patent: 4630845 (1986-12-01), Sannee
patent: 4656474 (1987-04-01), Mollier et al.
patent: 4729128 (1988-03-01), Grimes et al.

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