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:
Jun. 09, 1992
Filed:
Mar. 27, 1990
Applicant:
Inventors:
Ralph H Carmen, Lebanon, NJ (US);
John W Van Horn, Harrison, AR (US);
Assignee:
Duncan Industries Parking Control Corp., Harrison, AR (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G07D / ; G07F / ;
U.S. Cl.
CPC ...
194210 ; 194317 ;
Abstract
An improved magnetic field sensor for detecting tokens is disclosed which has one Hall effect sensor located between a magnet and an inclined token track base and another Hall effect sensor located between another magnet and the inclined token track base. The Hall effect sensors are placed at distances above the inclined token track base which optimize their accuracy in detecting tokens which have two concentric regions with different magnet characteristics.