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. 19, 1995
Filed:
Nov. 04, 1993
Applicant:
Inventor:
Ronald A Levac, Hartland, WI (US);
Assignee:
Adaptive Micro Systems, Inc., Milwaukee, WI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G09G / ;
U.S. Cl.
CPC ...
345 82 ; 345212 ;
Abstract
A display sign includes a matrix of LED lights which are energized from an unregulated power supply during periodic duty cycles. The duty cycles are adjusted by a programmed microprocessor such that the power supply is not overloaded when a large number of LEDs are energized, and such that excessive power is not applied to the LEDs when a small number of LEDs are energized and the power supply voltage increases.