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. 10, 1995
Filed:
Mar. 01, 1994
Yuko Murakami, Ibaraki, JP;
Takayuki Nakakawaji, Hitachi, JP;
Mitsuyoshi Shoji, Ibaraki, JP;
Juichi Arai, Ibaraki, JP;
Yutaka Ito, Takahagi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A lubricant comprising a multifunctional ammonium carboxylate represented by the general formula (1) and a magnetic recording medium comprising a non-magnetic support having a magnetic layer thereon, on the top of which a protective film is formed, wherein the lubricant is coated on the medium to form a lubricant film. ##STR1## where n is an integer of 2 to 4, Rf represents a non-branched, linear perfluoropolyether chain having an average molecular weight of 3000 to 10000, R.sup.1 and R.sup.2 represent hydrogen or an alkyl group, and R represents an organic group of two to four valences having one or more aromatic rings.