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:
May. 07, 2002
Filed:
Aug. 31, 1999
Applicant:
Inventors:
Jesse Wu, Dunwoody, GA (US);
James H. Han, Alpharetta, GA (US);
Assignee:
BP Corporation North America Inc., Chicago, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C 4/420 ;
U.S. Cl.
CPC ...
B29C 4/420 ;
Abstract
An improved coat hanger extrusion die wherein the aperture of the die land widens along the extrusion axis of said die to the die exit opening, thereby forming an expansion zone, and a method for extruding foamed polypropylene sheet having an improved surface appearance.