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. 24, 1991
Filed:
Aug. 22, 1989
Applicant:
Inventors:
Mitsuo Katayose, Hitachi, JP;
Nobuyuki Hayashi, Hitachi, JP;
Seiji Tai, Hitachi, JP;
Takayuki Akimoto, Hitachi, JP;
Koichi Kamijima, Hitachi, JP;
Hideo Hagiwara, Hitachi, JP;
Assignee:
Hitachi Chemical Company, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03C / ; G03C / ; C09B / ;
U.S. Cl.
CPC ...
430495 ; 430270 ; 430945 ; 540128 ; 540131 ; 540140 ;
Abstract
A naphthalocyanine derivative having at least one substituent of the formula: SO.sub.2 R.sup.1, wherein R.sup.1 is an alkyl group, a substituted alkyl group or an aryl group is excellent in ability to absorb diode laser beams and suitable for use in an optical recording medium.