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. 23, 2001
Filed:
Aug. 09, 1999
Applicant:
Inventors:
Kouhei Endo, Sagamihara, JP;
Hiroshi Tokuda, Sagamihara, JP;
Assignee:
Teijin Limited, Osaka, JP;
Primary Examiner:
Int. Cl.
CPC ...
B32B 2/736 ; B29C 5/500 ; B29C 5/512 ; B29C 5/514 ;
U.S. Cl.
CPC ...
B32B 2/736 ; B29C 5/500 ; B29C 5/512 ; B29C 5/514 ;
Abstract
A biaxially oriented polyester film which has good thickness nonuniformity in both longitudinal and transverse directions, uniform physical properties in a transverse direction and high strength in a longitudinal direction. This film has such characteristic properties that (a) an F-5 value in a longitudinal direction of 13 kg/mm,or more, (b) a thickness nonuniformity in each of both longitudinal and transverse directions of 8% or less, and (c) a difference in the heat shrinkage factor of 0.02 to 0.2% per 1 m in a transverse direction, said heat shrinkage factor being measured at 105° C. in the longitudinal direction.