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. 15, 1977
Filed:
Jul. 07, 1975
Applicant:
Inventors:
Edward Korostoff, Philadelphia, PA (US);
Gary K Zin, Philadelphia, PA (US);
Assignee:
Matcon, Inc., Philadelphia, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29F / ;
U.S. Cl.
CPC ...
425461 ; 4253 / ;
Abstract
An extrusion die is made by stretching a flexible membrane having one end held in a shape conforming to the input end of the die and the other end maintained in conformity with the desired profile of the part to be extruded. A fluid having hardening properties is applied to one surface of the distended membrane. Once the material has hardened, the flexible diaphragm is stripped away, and the resultant contour is coated with a material to form the contour of the die. This contour is cast in a shell, with appropriate heat and heat sensing elements, to form the die.