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. 01, 2011
Filed:
Dec. 27, 2006
Applicants:
Hirotoshi Inomata, Tokyo, JP;
Hiroshi Yoshida, Okayama, JP;
Inventors:
Hirotoshi Inomata, Tokyo, JP;
Hiroshi Yoshida, Okayama, JP;
Assignee:
Dowa Holdings Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F23M 9/10 (2006.01); F23G 5/30 (2006.01); F28F 21/08 (2006.01);
U.S. Cl.
CPC ...
Abstract
A heat exchanger tubeincludes: a first cover layerprovided on an outer side of a tube main bodyto partly or completely cover a tube main body; and a second cover layerprovided on an outer side of the first cover layerto partly or completely cover the first cover layerThe first cover layeris formed by overlay-welding a material higher in ductility than the second cover layerto the tube main bodyThe second cover layeris formed by overlay-welding a material higher in hardness than the first cover layerto the first cover layer