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:
Mar. 25, 2014
Filed:
Apr. 09, 2009
Applicants:
Soji Sumi, Matsuyama, JP;
Yukihiro Tokunaga, Matsuyama, JP;
Inventors:
Soji Sumi, Matsuyama, JP;
Yukihiro Tokunaga, Matsuyama, JP;
Assignee:
Miura Co., Ltd., Matsuyama-shi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F22B 25/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A boiler has an upper header, a lower header and a heat-transfer tube. The heat-transfer tube connects the upper header with the lower header. The hear-transfer tube is provided with projections such that a heat-transfer area per unit length of the heat-transfer tube is smaller in an upstream region than that in a downstream region of combustion gas.