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. 17, 1998
Filed:
Feb. 06, 1997
Wolfgang Streubel, Detmold, DE;
Udo Klasfauseweh, Gutersloh, DE;
Benteler AG, Paderborn, DE;
Abstract
A method of manufacturing a pipe having sections with different cross-sectional configurations includes initially providing a sheet bar which has a rectangular base portion and at least one formation section integrally connected to the base portion. In the next step, the sheet bar is shaped into a hollow-cylindrical body. In this step, the base portion is deformed into a tubular shape and the formation section is deformed into a spiral shape. Subsequently, the final shaping of the pipe is carried out which may constitute widening of the formation section by a block which acts from the inside. In a subsequent joining procedure, abutting edges are connected.