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. 22, 1989
Filed:
Oct. 16, 1987
Applicant:
Inventors:
Takeshi Kakuta, Kanagawa, JP;
Takahito Miyoshi, Kanagawa, JP;
Assignee:
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F / ;
U.S. Cl.
CPC ...
427128 ; 428694 ; 428900 ;
Abstract
A method for preparing a magnetic recording medium comprising the steps of pre-dispersing ferromagnetic particles and a binder in a solvent, mixing and dispersing with an additional binder, and coating thus obtained magnetic coating composition on a support, wherein said ferromagnetic particles having a specific surface area S.sub.BET of 40 m.sup.2 /g or more and an absorved moisture content of less than 0.8 wt. % are pre-dispersed in said solvent containing cyclohexanone in an amount of 80 wt. % or more.