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:
Dec. 29, 2009
Filed:
Feb. 13, 2007
Applicants:
Petur Thors, Decatur, AL (US);
Nikolai Zoubkov, Moscow, RU;
Inventors:
Petur Thors, Decatur, AL (US);
Nikolai Zoubkov, Moscow, RU;
Assignee:
Wolverine Tube, Inc., Huntsville, AL (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B21D 53/06 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method of forming a plurality of protrusions on the inner surface of a tube to reduce tube side resistance and improve overall heat transfer performance. The method includes cutting through ridges on the inner surface of the tube to create ridge layers and lifting the ridge layers to form the protrusions. In this way, the protrusions are formed without removal of metal from the inner surface of the tube, thereby eliminating debris which can damage the equipment in which the tubes are used.