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:
Nov. 24, 1987
Filed:
Feb. 10, 1987
Applicant:
Inventors:
Shigeo Utsumi, Yokohama, JP;
Tateo Kanesaki, Nagahama, JP;
Takashi Kagiyama, Yokohama, JP;
Satoshi Otonari, Machida, JP;
Koichiro Ikushima, Nagahama, JP;
Norio Okumura, Nagahama, JP;
Assignee:
Diafoil Company, Limited, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
428141 ; 428694 ; 428900 ;
Abstract
A polyester film suitable for use as a substrate for magnetic recording media, characterized in that said polyester film is a biaxially oriented polyester film having an average refractive index n and a planar orientation .DELTA.P, which respectively satisfy the following equations [I] and [II]:
Utsumi, Shigeo. (1987). Polyester films suitable for use in magnetic recording media (U.S. Patent No. 4708902). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4708902
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile