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:
Sep. 14, 1982
Filed:
Sep. 12, 1979
Christopher M Lewis, Newmarket, GB;
P A Management Consultants Limited, London, GB;
Abstract
A coin discriminating apparatus comprises two coils on opposite sides of a path for coins, one coil being connected to a signal generator so as to give repetitive abrupt flux changes and a gating device being provided for short circuiting the other coil but removing the short circuit a predetermined time delay after each flux change. A circuit is responsive to the amplitude of a voltage pulse which is produced across said other coil in response to each removal of the short circuit to discriminate between coins. This apparatus may form the second test of a two-test coin discriminating apparatus, wherein the first test measures a phase displacement caused by the coin passing between another pair of coils and this measurement is used to set the time delay to one of selected values, according to the expected coin, so that the voltage pulse will be of a constant amplitude for valid coins.