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:
Mar. 11, 1980
Filed:
Aug. 29, 1978
Applicant:
Inventors:
Franz-Josef Zilges, Monchen-Gladbach, DE;
Heinrich Kutz, Neuss, DE;
Assignee:
Schloemann-Siemag Aktiengesellschaft, Dusseldorf, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21B / ;
U.S. Cl.
CPC ...
72 45 ; 72 38 ;
Abstract
A tube extrusion press extrudes tubes through the annular space formed when a mandrel projects into the aperture of an extrusion die. In order to prevent oxidation of the extruded product, the outside of the tube passes into a cooling section immediately downstream of the die, and a protective gas is blown into the interior of the tube through the mandrel which is hollow and has an opening in its tip. Both the inside and the outside of the tube may be coated with a liquid emulsion, and the hollow mandrel can have internal channels for the passage of a cooling liquid.