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:
Apr. 09, 1985
Filed:
May. 13, 1983
Applicant:
Inventor:
Heinz Ratheiser, Vienna, AT;
Assignee:
American Maplan Corporation, McPherson, KS (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B29F / ;
U.S. Cl.
CPC ...
425197 ; 2642098 ; 425380 ; 425467 ;
Abstract
An extrusion head for producing hollow profiles such as thick-wall large diameter PVC pipe has its flow channel divided by a hollow mandrel into two coaxial portions of a flow cross section greater than that of the common portion of the flow channel downstream of these coaxial portions and running through the mouth of the head. According to the invention, the flow channel progressively diminishes the flow section over the length thereof at least from the plate at which the coaxial portions start to eliminate structural defects caused by failure of the streams of synthetic resin to adequately merge.