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:
Jul. 17, 1984
Filed:
Aug. 21, 1981
Applicant:
Inventors:
Elwood E Barnes, Parkesburg, PA (US);
Thomas L Flack, Philadelphia, PA (US);
Assignee:
Mars, Inc., McLean, VA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G07F / ;
U.S. Cl.
CPC ...
133 / ; 133 / ; 1941 / ;
Abstract
A coin presence sensing apparatus comprises one or more ringing electronic oscillator circuits at least some of which include an inductor having a dumbbell shaped core adjacent a coin passageway. A pulse generating circuit is provided to selectively pulse each oscillator circuit. After the oscillator is pulsed, it begins to oscillate. Coin proximity during the time the oscillating circuit oscillates is determined by comparing the output of the oscillating circuit with the output of an oscillating circuit having a reference inductor isolated from coins.