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:
Dec. 27, 1988
Filed:
Dec. 24, 1986
Applicant:
Inventors:
Motomi Nogiwa, Zushi, JP;
Shuichi Yoshida, Yokohama, JP;
Shigeki Komori, Sagamihara, JP;
Toshitsune Yoshikawa, Kawasaki, JP;
Toshio Koutsuka, Yokohama, JP;
Assignee:
Nippon Petrochemicals Company, Limited, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ; B29C / ;
U.S. Cl.
CPC ...
264 41 ; 264154 ; 2642888 ; 2642902 ; 521134 ; 525240 ;
Abstract
A process for preparing a porous film or sheet, which process comprises melt-forming a composition into a film or sheet and then stretching the thus-formed film or sheet at a temperature in the range of 30.degree. to 110.degree. C., said composition containing: