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:
Sep. 10, 2013
Filed:
Jun. 02, 2010
Applicants:
Ikuo Tsunekawa, Nagoya, JP;
Keiichi Ito, Nagoya, JP;
Inventors:
Ikuo Tsunekawa, Nagoya, JP;
Keiichi Ito, Nagoya, JP;
Assignee:
Rinnai Corporation, Nagoya-Shi, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F24H 3/06 (2006.01);
U.S. Cl.
CPC ...
Abstract
A drain pipeincludes an upper end portionwhich is connected to a concaveof a leading endof an exhaust tube, and a lower end portionwhich is opened to the inside of a warm air furnace below the concave. The lower end portionis formed as a tubular portion where a membrane is formed at a plane orthogonal to an axis lineby a surface tension of a drain. A leading endof the tubular portion is formed as an openingwith an area large enough such that the membrane is not generated by the surface tension of the drain.