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, 1985
Filed:
May. 23, 1983
Applicant:
Inventors:
Granville J Hahn, Big Spring, TX (US);
Raleigh N Rutledge, Big Spring, TX (US);
Jackie D Murley, Big Spring, TX (US);
Assignee:
Cosden Technology, Inc., Dallas, TX (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B29F / ;
U.S. Cl.
CPC ...
264173 ; 2642098 ; 4251311 ; 4251331 ; 425462 ;
Abstract
A process is disclosed for the coextrusion of a multi-layered tube whereby at least one stream of molten polymer from a single-screw extruder is passed through a die; wherein the stream is divided into two concentric streams which are balanced by varying the area of a restrictor orifice placed in the central stream. Spider lines in the outer molten stream are eliminated by the use of a second restrictor means used downstream of an open chamber for reuniting the melt, which chamber is downstream of the spider legs.