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:
Aug. 19, 1997
Filed:
Sep. 13, 1995
Applicant:
Inventors:
Kazuya Ogino, Minoo, JP;
Kaneo Yokoyama, Nara, JP;
Narutoshi Hayashi, Niihama, JP;
Takashi Omura, Kobe, JP;
Assignee:
Sumitomo Chemical Company, Limited, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09B / ; G02B / ;
U.S. Cl.
CPC ...
534678 ; 534684 ; 534685 ; 534714 ; 534806 ; 252585 ; 8506 ;
Abstract
A tetrakisazo compound of the formulae: ##STR1## wherein Q.sup.1 represents a phenyl or naphthyl group, Q.sup.2 represents a phenyl which is substituted by at least one substituent selected from a hydroxy group and an amino group, and R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each independently represents a hydrogen atom, a hydroxy group, a lower alkyl group, a lower alkoxy group or a substituted or unsubstituted amino group, or a salt thereof, and a polarizing film which comprises the tetrakisazo compound or a salt thereof and which may further comprise other organic dyes.