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:
Jan. 31, 1995
Filed:
Jul. 02, 1993
Applicant:
Inventors:
Hans W Steinmetz, Schaffhausen, CH;
Dirk A Petry, Feuerthalen, CH;
Assignee:
Georg Fischer Rohrleitungssysteme AG, Schaffhausen, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16L / ;
U.S. Cl.
CPC ...
219535 ; 1563042 ; 285 21 ; 285286 ;
Abstract
For welding tubular plastic parts (1) formed as a compound tube there is used a welding element (20) which is arranged with its inner peripheral surface (23) on projections (10) of the tubular parts (1) and reciprocally centers them. The welding element (20) has an annular part (21) with a heating coil (22) on its outer contour. The heating coil (22) has coil strands laid in a zig-zag shape which are curved in a U-shape and extend transversely to the peripheral direction of the annular part (21).