The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 10, 1988
Filed:
Jun. 19, 1986
Bernhard Trummer, Bern, CH;
Autelca AG., Gumligen, CH;
Abstract
The coin to be checked for several characteristics influences, partially in succession and partially simultaneously, the coils (7-12) of several oscillator tank circuits (1-6). The oscillator tank circuits (1-6) are correspondingly connected to an amplifier (14) for the formation of an oscillator, individually in succession, those circuits with simultaneously influenced coils being connected periodically in alternation to this amplifier. Thereby, successive and simultaneous, high-frequency test signals are produced which are nested in one another in accordance with the time-division multiplex principle, these test signals corresponding to the influences exerted by the coin on the oscillator tank circuit coils (7-12). These test signals, after demodulation (19) and analog-to-digital conversion (20), are compared in an evaluating unit (22) individually with criteria stored in a memory (23) for each type of coin to be accepted.