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:
Jun. 08, 1993
Filed:
Apr. 06, 1989
Applicant:
Inventors:
Seiji Tai, Hitachi, JP;
Nobuyuki Hayashi, Hitachi, JP;
Koichi Kamijima, Hitachi, JP;
Mitsuo Katayose, Hitachi, JP;
Takayuki Akimoto, Hitachi, JP;
Hideo Hagiwara, Hitachi, JP;
Assignee:
Hitachi Chemical Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ; C09B / ;
U.S. Cl.
CPC ...
430495 ; 430270 ; 430945 ; 540123 ; 540124 ; 540125 ; 540126 ; 540127 ; 540128 ; 540140 ;
Abstract
Special tetraazaporphins containing Si, Ge or Sn as the central metal are useful for forming a recording layer in an optical recording medium.