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:
May. 13, 2003
Filed:
Apr. 13, 2000
Applicant:
Inventor:
Kenneth Lennartsson, Torekov, SE;
Assignee:
Protol A.G., Glarus, CH;
Primary Examiner:
Int. Cl.
CPC ...
F16L 1/116 ;
U.S. Cl.
CPC ...
F16L 1/116 ;
Abstract
In a method for producing helically wound lock-seam tubing, a metal strip is fed to a forming head in which the tubing is formed. In order to frictionally interlock this lock seam, a flexible string is inserted into and compressed in the lock seam during manufacture.