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:
Jul. 09, 2002
Filed:
Jun. 06, 2000
Yoshihiro Baba, Tokyo, JP;
Toshiki Miyazawa, Tokyo, JP;
Hidaka Seiki Kabushiki Kaisha, Tokyo, JP;
Abstract
In the method of manufacturing a heat exchanger, transverse sectional shapes of heat exchanging tubes can be easily formed into elliptical shapes. The method includes the steps of: piling metallic fins, each of which includes collared through-holes, so as to form tube holes, which are formed by connecting the collared through-holes; piercing heat exchanging tubes, whose transverse sectional shapes are circular shapes, through the tube holes; and inserting expanding bullets, whose transverse sectional shapes are elliptical shapes, into the heat exchanging tubes. The heat exchanging tubes are elliptically expanded to and integrated with the metallic fins.