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:
Oct. 11, 1994
Filed:
Jun. 21, 1993
Applicant:
Inventors:
Melvin L Luetkens, Jr, Batavia, IL (US);
Robert D Pischke, Duluth, GA (US);
John C Schubert, Marietta, GA (US);
Assignee:
Amoco Corporation, Chicago, IL (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
15624411 ; 156 94 ; 15624424 ; 15624427 ; 264 37 ; 264 38 ; 428 354 ; 428 367 ; 4283044 ; 4283179 ; 4283197 ;
Abstract
A method of producing a thermoplastic foam sheet comprising the step of (a) foaming, by extrusion, a mixture comprising polystyrene and a thermoplastic reclaim material obtained from a multi-layer sheet manufacturing process, wherein said thermoplastic reclaim material comprises polystyrene and a thermoplastic barrier resin selected from the group consisting of (i) copolymers of ethylene and vinyl alcohol, and (ii) polymers comprising a copolymer of acrylonitrile, to produce a foam sheet having an upper and lower surface.