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:
Dec. 22, 1992
Filed:
Feb. 19, 1992
Shigeru Nakano, Toyoshina, JP;
Kosaku Mitani, Osaka, JP;
Nihon Dennetsu Co., Ltd., Tokyo, JP;
Osaka Nishikawa Co., Ltd., Osaka, JP;
Abstract
An electric heating appliance which is provided with a connecting terminal selecting circuit for the purpose of generating heat in an electric heater in a negative cycle of a commercial AC power source no matter which pole of a plug is connected to a grounding electrode of the power source when the plug is inserted into a plug socket of the power source, the connecting terminal selecting circuit consisting of a delay switch circuit adapted to insulate a heater circuit from the power source for a predetermined period of time when a power source switch is turned on, a heater potential detecting circuit adapted to detect the grounding electrode of the power source, and a change-over switch circuit adapted to connect the anode of an electric power controlling rectifying element for controlling the electric heater to the grounding electrode of the AC power source in accordance with an output signal from the heater potential detecting circuit.