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. 24, 1985
Filed:
Sep. 27, 1982
Applicant:
Inventor:
Donald E Hooker, Glen Ellyn, IL (US);
Assignee:
Bally Manufacturing Corporation, Chicago, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A63B / ;
U.S. Cl.
CPC ...
2731 / ; 2731 / ; 2731 / ;
Abstract
A ball detector senses and signals the presence of a metal containing ball near preselected points on a game playfield. The ball detector is positioned to avoid contact with the ball and includes an electromagnet for generating a magnetic flux near the preselected points on the game playfield and a sensor for measuring the time rate of change of the magnetic flux induced by passage of the ball through the magnetic flux.