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:
Aug. 10, 2010
Filed:
Feb. 23, 2004
Applicant:
Sven Sjöberg, Vasa, FI;
Inventor:
Sven Sjöberg, Vasa, FI;
Assignee:
Oy KWH Pipe Ab, Vasa, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16L 9/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
This invention relates to a hollow profile () used for the manufacture of a spirally wound double-walled thermoplastic pipe, which hollow profile has essentially a rectangular cross section and the wall () of the hollow profile intended to form the inner wall of the pipe is thicker than the wall () intended to form the outer wall () of the pipe. The invention is characterized in that the inner rounding radius () of the edges adjacent to the thicker wall () of the hollow profile is considerably larger than the rounding radius () of the two other edges of the cavity ().