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:
Mar. 14, 1989
Filed:
Oct. 17, 1986
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A magnetic recording medium comprising a nonmagnetic support and a magnetic recording layer provided on said support, said magnetic recording layer comprising a ferromagnetic powder dispersed in a binder, which is characterized in that said binder comprises a polyurethane resin which has a repeating unit derived from diol having the formula (I); ##STR1## in which R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are the same or different from each other, each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 is any one of a hydrogen atom, a saturated or unsaturated aliphatic group having 1-5 carbon atoms, an aromatic group and a cyclic aliphatic group, and at least three substituents among R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are not hydrogen atoms; and l, m, n and p are independently integers of 1-3, 0-2, 1-3, and 1-3, respectively.