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:
Dec. 10, 1991
Filed:
Dec. 06, 1989
Jiro Amano, Osaka, JP;
Syunroku Toyama, Shiga, JP;
Toray Industries, Inc., Nihonbashi-Muromachi, JP;
Abstract
A polarization film which has excellent polarizing ability and resistance to moisture and heat is described. The polarization film includes an oriented polyvinyl-alcohol-type film having iodine adsorbed thereon, and contains a zirconium compound or a manganese compound. The zirconium compound or the manganese compound is thought to prevent dissociation of a polyiodide ion such as I.sub.3.sup.- or I.sub.5.sup.- capable of providing the polarizing ability. The polarization film of the invention may be suitable for use in a variety of liquid crystal displays, including those which are used in severe environments, such as automotive display devices, and in ordinary household devices, for example word processors.