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:
Feb. 13, 2007
Filed:
Mar. 17, 2004
Atsuhiro Ohkawa, Kanagawa, JP;
Michitaka Matsuumi, Kanagawa, JP;
Hideyuki Nishikawa, Kanagawa, JP;
Fuji Photo Film Co., Ltd., Minami-Ashigara, JP;
Abstract
To provide a retardation film (optical compensation sheet) using a liquid crystal compound excellent in both the wavelength dispersion property and the refractive index anisotropy, disclosed is a retardation film having an optically anisotropic layer formed of a compound represented by formula (I): [(R)a—M—(L)]b—(L), wherein Rrepresents an alkyl group, at least one —CH— group in the alkyl group may be substituted by —O—, —S—, —C(═O)—, —N(R)—, —CH═CH— or —C≡C—, Rrepresents a hydrogen atom or an alkyl group, M represents a group comprising three or more aromatic rings, Lrepresents a single bond or a divalent alkylene group, the —CH— group in the alkylene group may be substituted by —O—, —S—, —C(═O)— or —N(R)—, Lrepresents a b-valent cyclic, alkene or alkyne group, a represents the number of Rs substituted to M, and b represents an integer of 2 to 6.