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. 23, 1994
Filed:
Nov. 18, 1992
Applicant:
Inventors:
Yoshikazu Fujii, Nara, JP;
Tetsuya Inui, Nara, JP;
Toshihisa Deguchi, Nara, JP;
Kenji Ohta, Osaka, JP;
Assignee:
Sharp Kabushiki Kaisha, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ;
U.S. Cl.
CPC ...
3692754 ; 3692752 ; 369 13 ;
Abstract
An optical memory device comprising a substrate and guide tracks having a depth of .lambda./8n or less formed on said substrate, wherein .lambda. is the wavelength of laser light used for the optical memory device, and n is the refraction index of the guide track portion of the substrate.