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:
Oct. 02, 1990
Filed:
Mar. 23, 1990
Applicant:
Inventors:
Assignee:
Diafoil Company, Limited, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C08G / ; C08G / ; B32B / ;
U.S. Cl.
CPC ...
428220 ; 428 64 ; 528272 ; 528298 ; 528302 ; 5283082 ; 2642884 ; 2642902 ;
Abstract
A biaxially oriented polyester film for floppy disks which has an in-plane thermal expansion coefficient (.alpha..sub..gamma.) of (1.7.+-.0.8).times.10.sup.-5 /.degree.C. and a shrinkage of not more than 0.03% after 72-hour treatment under the conditions of 60.degree. C. and 80% RH, and which simultaneously satisfies the following relationships (1) to (6):