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. 31, 2006
Filed:
Aug. 16, 2002
Hiroshi Hashimoto, Odawara, JP;
Katsuhiko Meguro, Odawara, JP;
Yuichiro Murayama, Odawara, JP;
Masahiko Mori, Odawara, JP;
Hiroshi Hashimoto, Odawara, JP;
Katsuhiko Meguro, Odawara, JP;
Yuichiro Murayama, Odawara, JP;
Masahiko Mori, Odawara, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
Provided is a magnetic recording medium having excellent dispersibility, smoothness and electromagnetic characteristics. The magnetic recording medium comprises at least one magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support. Said ferromagnetic powder is a ferromagnetic metal powder having an average major axis length of 10 to 80 nm and a crystallite size of 8 to 18 nm, or a ferromagnetic hexagonal ferrite powder having an average plate diameter of 5 to 40 nm, and said binder comprises 0.2 to 0.7 meq/g of at least one polar group selected from —SOM, —OSOM, —PO(OM), —OPO(OM)and —COOM (where M denotes a hydrogen atom, alkali metal or ammonium salt), and/or 0.5 to 5 meq/g of at least one polar group selected from —CONRR, —NRRand —NRRR(where R, Rand Rindependently denote hydrogen atoms or alkyl groups).