F - Mech Eng,Light,Heat,Weapons – 28 – F
Patent
F - Mech Eng,Light,Heat,Weapons
28
F
F28F 9/18 (2006.01) B21D 53/08 (2006.01) B25J 9/00 (2006.01) B25J 9/08 (2006.01) F28F 9/02 (2006.01)
Patent
CA 2085966
Abstract of the Disclosure A heat exchanger comprising opposed parallel header tubes having circumferentially spaced grooves along he 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.
Marks & Clerk
Wallis Bernard J.
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