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:
Nov. 02, 1993
Filed:
Mar. 25, 1991
Applicant:
Inventor:
Hideo Tanaka, Aichi, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B / ;
U.S. Cl.
CPC ...
219 / ;
Abstract
A power source circuit for a microwave oven is provided with first and second door switches that are opened by opening the door of the microwave heating chamber and a third door switch having a movable contact that is converted to first and second fixed contacts in response to closing and opening the door respectively. The circuit insures safe cut off of the microwave magnetron even if the first door switch does not open upon opening the door and also in the event of grounding of the primary of a high voltage transformer.