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. 16, 1977
Filed:
Apr. 08, 1975
Applicant:
Inventors:
Yoshiyuki Asahara, Kawasaki, JA;
Tetsuro Izumitani, Hino, JA;
Assignee:
Hoya Glass Works, Ltd., Tokyo, JA;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
252300 ; 252501 ; 3401 / ; 3501 / ;
Abstract
A non-crystalline substance for use in an optical memory device which consists of an As-Se system non-crystalline material and the additional third component(s) Zn, Au, or Ag and/or Cu. The substance is characterized by its transmission ability in the visible region as well as in the I.R. region and its extreme reduction of transmittance upon irradiation with, e.g., a laser beam.