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. 07, 1999
Filed:
Apr. 18, 1997
Applicant:
Inventors:
Hidekazu Matsuura, Oyama, JP;
Yoshihiro Nomura, Ichihara, JP;
Assignee:
Hitachi Chemical Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
428346 ; 428343 ; 428339 ;
Abstract
A composite film, comprising a base film and an adhesive layer on one or both sides of the base film, the composite film having a thickness of T (.mu.m), the base film having an edge tearing strength of R (kg/20mm), the adhesive layer having a total thickness of A, the base film having a thickness of B, T being related to R by a numerical formula R>0.6T-8 when T.ltoreq.60, or by a numerical formula R.gtoreq.28 when T>60, and A/B being 0.5 to 1.4.