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:
Aug. 18, 1987
Filed:
Mar. 21, 1986
Applicant:
Inventors:
Dennis Morris, Fairfield, NJ (US);
Frank Goffreda, Union, NJ (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
4251331 ; 2642098 ; 425380 ; 425462 ;
Abstract
A co-extrusion die can simultaneously extrude different extrudate into a multilayer tube. The die has a plurality of mandrels and a casing having an inlet side and an outlet side. The mandrels are coaxially nested in the casing. This casing is shaped on the interior of its outlet side to mate with the mandrels and provide an annular outlet. The casing and the mandrels are positioned and shaped to provide a plurality of interspaces. At least one of the interspaces is shaped to define an annular passage. Another interspace is shaped to define a spiral passage. These annular and spiral passages communicate with the annular outlet.