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:
Nov. 09, 1976
Filed:
Nov. 20, 1975
Applicant:
Inventor:
Warner Jan De Putter, Hardenberg, NL;
Assignee:
Industriele Onderneming Wavin N.V., Zwolle, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
264 68 ; 264310 ; 264312 ;
Abstract
The invention relates to a method for providing a thermoplastic pipe with an inner groove, by subjecting a heat plasticized pipe to the action of some rotatably supported deforming rollers which are expanded and rotated by means of a mandril. A relative rotating motion between said deforming rollers and the pipe is maintained until the pipe is no longer permanently deformable and the relatieve rotating motion is maintained to strengthen the walls of said groove.