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:
Jun. 30, 1998
Filed:
Nov. 28, 1995
Applicant:
Inventors:
Hans-Werner Steinmetz, Schaffhausen, CH;
Dirk Alexander Petry, Feuerthalen, CH;
Assignee:
Georg Fischer Rohrleitungssysteme AG, Schaffhausen, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B31F / ;
U.S. Cl.
CPC ...
156158 ; 1562742 ; 156293 ; 1563042 ; 1563043 ; 1563046 ; 285 211 ; 285 212 ; 285903 ;
Abstract
In a process for the connecting of plastic tubes the wall of which has a corrugated cross section by electro-thermal welding, filling cores of plastic are inserted in the corrugation troughs of the tubes to be connected on both sides of a welding joint in order to form a resting surface on the outer circumference of the tubes and an electric heating mat which surrounds the resting surface of all filling cores is placed on the resting surface.