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. 05, 1980
Filed:
Dec. 05, 1977
Applicant:
Inventors:
Loyd B Hutchinson, Denham Springs, LA (US);
Robert R Blanchard, Port Allen, LA (US);
Assignee:
The Dow Chemical Company, Midland, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29F / ;
U.S. Cl.
CPC ...
264171 ; 2641 / ; 264209 ;
Abstract
Process and apparatus for extruding synthetic resinous thermoplastic materials, wherein a heat plastified stream of such material is divided into a primary or core stream, and non-primary or secondary stream(s), the secondary stream(s) heated to a temperature substantially hotter than the core stream, and the hot secondary stream(s) thereafter layered onto the opposite surfaces of the core stream prior to expelling the material from an extrusion die. Such a process and apparatus is practiced to avoid a loss of surface smoothness in the extruded product.