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:
Mar. 02, 1993
Filed:
Sep. 11, 1990
Applicant:
Inventors:
Rikuo Hatano, Aichi, JP;
Yoshifumi Iwata, Aichi, JP;
Assignee:
Aisin Seiki K.K., Kariya City, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02J / ;
U.S. Cl.
CPC ...
361 64 ; 307 101 ;
Abstract
A power supply circuit for an automobile including an electric automotive appliance having a memory, a main battery, a backup battery, an ignition key switch, a battery switching circuit for connecting one of the main and backup batteries to the electric automotive appliance, a power detector for detecting a charged power in the backup battery, a limiting circuit for limiting the operation of the electric automobile appliance to only a power backup of the memory, and a control circuit for activating the limiting circuit when a charged power in the backup battery is detected to be below a predetermined level.