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:
Jan. 15, 1985
Filed:
Sep. 29, 1982
Applicant:
Inventor:
Frederic P Heiman, Philadelphia, PA (US);
Assignee:
Mars, Inc., McLean, VA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G07F / ;
U.S. Cl.
CPC ...
1941 / ; 73163 ;
Abstract
A method and apparatus for coin examination which transmits on one side of a coin a low frequency electromagnetic field from a transmitter inductor which is part of a transmitter circuit, monitors the frequency of the low frequency electromagnetic field, receives a portion of the field on the other side of the coin with a receiving inductor which is part of a receiving circuit, measures the phase shift between the transmitted signal and the received signal, and determines if the measured phase shift corresponds to the phase shift for an acceptable coin at the monitored frequency.