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. 22, 1988
Filed:
Jul. 22, 1986
Mitsuo Takai, Nara, JP;
Takashi Tanahashi, Ikoma, JP;
Masahito Uemura, Kashiwara, JP;
Yasukiyo Ueda, Shiki, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An instantaneous water heater with enhanced temperature control and less variation in output water temperature has an output hot water pipe extending into a heating tank through the top thereof and surrounded by a coiled sheath electric heater for heating the water in the tank, the output pipe extending to the tank bottom and provided with an inlet thereat. An inlet pipe for water to be heated extends into the bottom of the tank and is throttled to provide an accelerated flow of incoming water away from the heater and outlet pipe toward an overheat prevention thermostat mounted externally on the top of the tank and connected to the heater. An output hot water temperature sensor located within the output water pipe adjacent the inlet thereof cooperates with a control unit of regulating operation of the heater to maintain the hot water output temperature at a preset level. The inlet to the water output pipe is throttled to insure mixing of the heated water, accurate temperature measurement and the reduction of scale deposition on the temperature sensor.