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:
Feb. 12, 2008
Filed:
Oct. 03, 2003
Applicants:
Heinrich Dohman, Hoexter, DE;
Stefan Wickenkamp, Bad Oeynhausen, DE;
Inventors:
Heinrich Dohman, Hoexter, DE;
Stefan Wickenkamp, Bad Oeynhausen, DE;
Assignee:
American Maplan Corporation, McPherson, KS (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B28B 3/20 (2006.01);
U.S. Cl.
CPC ...
Abstract
An mandrel for extrusion of hollow bodies, such as, polyvinyl chloride (PVC) hard, compact, and foamed pipes, includes an inner collar, an outer collar, and a middle collar, each of the collars being radially joined by webs to the particular adjoining collar. Each interior web and exterior web, relative to the middle collar, can form a web pair, the webs of the web pair being arranged to overlap at least partially in the radial direction in a particular embodiment.