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:
Aug. 16, 1983
Filed:
Dec. 11, 1981
Applicant:
Inventors:
Yutaka Nakashima, Tokyo, JP;
Akira Okada, Tokyo, JP;
Assignee:
TDK Electronics Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; B32B / ;
U.S. Cl.
CPC ...
428328 ; 252 6254 ; 252 6256 ; 360134 ; 360135 ; 360136 ; 427128 ; 427130 ; 427131 ; 428323 ; 428329 ; 428331 ; 428694 ; 428695 ; 428900 ;
Abstract
A magnetic recording medium comprises a substrate coated with a magnetic layer comprising a magnetic powder and a first non-magnetic powder of Al.sub.2 O.sub.3 and/or Cr.sub.2 O.sub.3 at a ratio of 0.5 to 15 wt. % based on said magnetic powder; a second non-magnetic powder of TiO.sub.2, SiC, SiO.sub.2, ZrO.sub.2 and/or CeO.sub.2 at a ratio of 0.5 to 15 wt. % based on said magnetic powder and a total of said non-magnetic powders of less than 20 wt. % based on said magnetic powder.
Nakashima, Yutaka. (1983). Magnetic recording medium (U.S. Patent No. 4399189). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4399189
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile