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:
Jul. 04, 2006
Filed:
Jul. 30, 2001
Arjan Dirk Van Lenthe, Schuinesloot, NL;
Jan Visscher, Lutten, NL;
Duncan Hamilton Wormald, Carrville, GB;
Jan Hendrik Prenger, Hardenberg, NL;
Arjan Dirk van Lenthe, Schuinesloot, NL;
Jan Visscher, Lutten, NL;
Duncan Hamilton Wormald, Carrville, GB;
Jan Hendrik Prenger, Hardenberg, NL;
Wavin B.V., , NL;
Abstract
A method for forming an integral socket to a pipe made from biaxially oriented thermoplastic material is described. The pipe has a pipe body and is provided, at one or both ends, with an integral socket. The biaxially oriented thermoplastic pipe is subjected to a socket-forming operation comprising the steps of fixing both axial ends of the unheated end part of the pipe, heating the fixed end part to a suitable socket-forming temperature in one or more steps, and expanding the axially fixed end part with the aid of a fluid pressure in the interior of the end part and/or a vacuum on the outer side of the end part, which expansion may begin as early as during the heating of the end part.