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. 11, 1992
Filed:
Jul. 12, 1990
Applicant:
Inventor:
Martin K Hitchcock, Newark, OH (US);
Assignee:
The Dow Chemical Company, Midland, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
264 22 ; 264 54 ;
Abstract
A foamed thermoplastic resin sheet is produced by a process comprising preheating in a chamber including a conveyor means for continuously conveying a radiation cross-linked thermoplastic resin sheet containing a blowing agent in a horizontally supported state and foaming said sheet in an expansion oven over a hot air blanket while continuously conveying said radiation cross-linked thermoplastic resin sheet in a horizontally supported state while applying a uniform tension across the width of the foamed sheet.