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:
Jul. 23, 1991
Filed:
Jun. 24, 1988
Seiji Tai, Hitachi, JP;
Shigeru Hayashida, Hitachi, JP;
Nobuyuki Hayashi, Hitachi, JP;
Hideo Hagiwara, Hitachi, JP;
Mitsuo Katayose, Hitachi, JP;
Koichi Kamijima, Hitachi, JP;
Takayuki Akimoto, Hitachi, JP;
Susumu Era, Hitachi, JP;
Setsuo Kobayashi, Hitachi, JP;
Akio Mukoh, Mito, JP;
Hitachi Chemical Co., Ltd., Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Novel naphthalocyanine derivatives are disclosed in the specification are useful for forming a recording layer in an optical recording medium. These derivatives are represented by the following formula (I): ##STR1## in which k, l, m and n, which may be the same or different, are zero or integers of 1 to 4, k+l+m+n being an integer of 1 or more; R.sup.1 's in a number of (k+l+m+n), which may be the same or different, are alkyl groups, substituted alkyl groups, or aryl groups; M is Si, Ge or Sn; and two Y's, which may be the same or different, are aryloxyl groups, alkoxyl groups, trialkylsiloxyl groups, triarylsiloxyl groups, trialkoxysiloxyl groups, triaryloxysiloxyl groups, trityloxyl groups, or acyloxyl groups. These derivatives are especially useful in the preparation of an optical recording medium.