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:
Feb. 18, 1992
Filed:
Nov. 13, 1990
Applicant:
Inventors:
Shigeru Okada, Isesaki, JP;
Nobuyasu Ando, Takasaki, JP;
Assignee:
Sanden Corporation, Gunma, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23P / ;
U.S. Cl.
CPC ...
29890043 ; 29890052 ; 29890054 ;
Abstract
A heat exchanger includes a pair of headers, a plurality of flattened oval heat exchange tubes, and a plurality of fins positioned between the headers over the length of the heat exchange tubes. The tubes are connected to the headers through a plurality of elongated holes in the header that have tapered lips. The lip taper forms an annular depression around the tube upon insertion that provides a good structural integrity. The connector holes are formed in each of the headers by a pressing method that eliminates header warping and produces dimensionally accurate hole shapes.