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:
Jul. 13, 1976
Filed:
Dec. 30, 1974
Hitoo Iwasa, Takatsuki, JA;
Gota Kano, Nagaoka, JA;
Matsushita Electric Industrial Co., Ltd., Kadoma, JA;
Abstract
A series connection comprising a transistor (4) and a light-emitting diode (3) is connected across a D.C. power source (+Vcc), and one end of a negative-resistance device (1) is connected to the base of said transistor (4) and the other end thereof is connected to an end of said light-emitting diode (3), which last-mentioned one end is connected to the D.C. power source (+Vcc). The circuit constituted as above memorizes an occurence of voltage drop which enables bistable switching in the negative-resistance device, thereby energizing the light emitting diode to light. The circuit can be used to indicate voltage lowering or interruption of an A.C. power supply, or weakening of a battery.