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. 16, 1993
Filed:
Jun. 30, 1992
Applicant:
Inventor:
Bernard J Wallis, Dearborn, MI (US);
Assignee:
Other;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F28F / ; B21D / ;
U.S. Cl.
CPC ...
165173 ; 165153 ; 165175 ; 165906 ; 29890043 ; 29890052 ;
Abstract
A heat exchanger comprising opposed parallel header tubes having circumferentially spaced grooves along the length thereof with inclined sides and a base on the external surface of the groove and spaced annular ribs on the inner surface opposite the grooves. Each groove has a transverse slot therein for receiving open ends of an elongated flat tube. Each header tube is made by performing a rolling operation to form the grooves and ribs. Thereafter, the grooved tubes are punched to form the transverse slots in the base of the grooves.