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. 07, 1999
Filed:
Aug. 20, 1997
Applicant:
Inventor:
Chen H Wu, Los Altos Hills, CA (US);
Assignee:
Leotek Electronics Corporation, Taipei, TW;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G08B / ;
U.S. Cl.
CPC ...
34081545 ; 34081573 ; 345 82 ; 362800 ; 362812 ; 31331804 ; 40570 ;
Abstract
Retrofitting lamps using Light-Emitting Diodes (LEDs) as the illumination source. The lamps are fitted with any one of the common incandescent lamp bases for use as retrofit lamps for illuminated EXIT signs and the like. The LED lamps are electrically powered with a current limiting device to allow LED to operate at a desired current level. The LEDs are arranged on a shaped frame so that they are aimed in directions to provide bright and uniform illumination over an area of the face of the sign that is wider and longer than the width and the length of the lamps.