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:
May. 29, 1990
Filed:
Dec. 23, 1987
Applicant:
Inventors:
Karlhans Staat, Ratingen, DE;
Hermann Moltner, Grevenbroich, DE;
Assignee:
Kocks Technik GmbH & Co., , DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21B / ; B21B / ; B21B / ;
U.S. Cl.
CPC ...
72 38 ; 72 96 ; 72 97 ; 72358 ;
Abstract
Ingots hot from rolling are pierced to form a hollow ingot by means of an internal tool of a press or skew-rolling line, and are subsequently elongated to form a tubular bloom by a stretching unit provided with a mandrel rod, and are finally finish-rolled. When inserting or withdrawing the internal tool into or out of the hollow ingot or the mandrel rod into or out of the tubular bloom, inert gas is introduced into the freed interior space in order to prevent scaling of the interior wall of the tubular bloom.