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. 11, 1978
Filed:
Jun. 21, 1976
Applicant:
Inventor:
Horst Biller, Kettwig, DE;
Assignee:
Mannesmannrohren-Werke, A.G., Dusseldorf, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21B / ;
U.S. Cl.
CPC ...
72234 ;
Abstract
A multistand, continuous stretch reducing mill is designed so that for the major reduction passes the largest to smallest diameter ratio changes by less than 0.4% from pass to pass and the squeeze length differential remains below 1.15 times the square root of the average logarithmic reduction (in millimeters) of the outer diameter of each pass. This way, polygonal inner contour and cracks in the pipe adjacent a roll gap is avoided.