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:
Apr. 14, 1992
Filed:
Feb. 12, 1990
Applicant:
Inventors:
Masahiro Yamada, N. White Plains, NY (US);
Hideo Yagi, Tokyo, JP;
Assignee:
Asahi Research Corporation, Shinagawa, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G08B / ;
U.S. Cl.
CPC ...
340636 ; 320 48 ; 324435 ; 354468 ;
Abstract
A light unit is combined with circuitry which monitors the charge level of a battery of the light unit or a video camera or camcorder connected to the light unit. With two lights of different wattages, three different constant loads can be applied while observing, in each case, LED indicators each deenergized at a certain voltage level, resulting in an accurate and reliable indication of charge level. The voltage levels are selectable in accordance with the type of battery being monitored and a bridge rectifier allows reversal of battery polarity.