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:
Sep. 26, 2000
Filed:
Oct. 14, 1999
Applicant:
Inventors:
Assignee:
Sumitomo Chemical Company, Limited, Osaka, JP;
Primary Examiner:
Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
428213 ; 428218 ; 4283198 ; 521 79 ; 521142 ;
Abstract
The present invention provides a polypropylene-based foamed sheet whose expansion ratio is 4 or more times characterized by expansion ratio A of the part (skin layer) up to 20% in each of the seat thickness from both surface of said polypropylene-based foamed sheet and expansion ratio B of part other than said skin layer (core layer) satisfying the following formula (1) and the like