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. 15, 2009
Filed:
May. 05, 2006
Applicants:
Yasunori Hyogo, Susono, JP;
Masaya Katsumata, Susono, JP;
Masami Asano, Susono, JP;
Inventors:
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F28F 1/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
An aluminum alloy-based extruded multi-path flat tube having a multiple number of passageways extending internally through the flat tube in parallel with one another and adapted to be coupled to other such flat tubes to form a heat exchanger after performing a brazing operation with the flat tube having a surface layer extending inwardly from the external surface containing at least 5% non-recrystallized grains and having an inner layer extending from the surface area containing at least 30% recrystallized grains.