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:
Apr. 10, 1990
Filed:
Jan. 29, 1988
Applicant:
Inventors:
Motoki Matsumoto, Aichi, JP;
Kouichi Watanabe, Aichi, JP;
Assignee:
Toyotomi Kogyo Co., Ltd., , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F24D / ;
U.S. Cl.
CPC ...
237 / ; 237 60 ;
Abstract
A hot water circulating system capable of increasing the amount of hot water to be circulated in each circulating cycle, decreasing energy loss and improving heat efficiency. The system includes an emptiness detecting switch which is adapted to detect start of emptying of water out of a water boiler being heated to a radiator. The switch is operatively connected directly or indirectly to an on-off valve so that the valve may be opened to flow water from an open tank to the water boiler when the switch detects start of the emptying.