Method of testing a security and a security for carrying out thi

Details Method of testing a security and a security for carrying out thi Method of testing a security and a security for carrying out thi

1985-01-09

1986-09-02

Spruill, Robert L.

Printed matter

Method

Identifying

283 74, 283 82, 283 83, 283 85, 283 91, 360114, 235493, B42D 1500

Patent

active

046092072

ABSTRACT:
A method of testing a security having a mechanically testable identifying mark, for example a security thread, which has a physical property, for example electric conductivity, which can be measured without contact by means of a first field, for example, an electric field. The physical property can be reproducibly influenced by the effect of a second field, for example an electromagnetic field. If this influence takes place periodically, a signal is produced as a measured variable modulated according to the mutual effect of the two fields.

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patent: 4253017 (1981-02-01), Whitehead

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