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:
Aug. 03, 1976
Filed:
Feb. 03, 1975
Applicant:
Inventors:
Helmut Landgraf, Rumeln-Kaldenhausen, DT;
Walter Quitmann, Angermund, DT;
Assignee:
Mannesmann Aktiengesellschaft, Dusseldorf, DT;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B65H / ;
U.S. Cl.
CPC ...
156187 ; 156192 ; 156195 ; 156229 ; 156244 ; 156361 ; 264173 ; 264 407 ;
Abstract
A steel pipe with longitudinal welding seam is wrapped helically by means of a polyethylene ribbon which is normally stretched, but temporary stretch relief provides for a thicker envelope above and adjacent to the seam. A ribbon deflector roll and a pressure roll provide the stretching through a speed differential which is changed as stretch relief.