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:
Aug. 15, 1989
Filed:
Nov. 15, 1988
Applicant:
Inventors:
Kengo Hirata, Nara, JP;
Katsumi Ishifuro, Yao, JP;
Assignee:
Sharp Kabushiki Kaisha, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B / ;
U.S. Cl.
CPC ...
219 / ; 219 / ; 219494 ; 219510 ; 99325 ; 374149 ;
Abstract
In a circuit for detecting the heating chamber temperature in a microwave oven, a switching transistor is connected in series or parallel with a heating chamber temperature detecting thermistor. If and when the heating chamber temperature need not be detected, the switching transistor is turned on when the switching transistor and thermistor are connected in parallel and off when the switching transistor and thermistor are connected in series to consequently prevent corrosion of the terminals of such thermistor.