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. 29, 1992
Filed:
May. 25, 1989
Applicant:
Inventor:
Bryan K Clark, Sunnyvale, CA (US);
Assignee:
Tandy Corporation, Ft. Worth, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ;
U.S. Cl.
CPC ...
369 94 ; 3692754 ;
Abstract
A method and apparatus for recording and reading both permanently stored information and user-supplied information on an optical disk are disclosed. The optical disk is provided with permanent information via pits in a substrate of the disk. User-supplied information is recorded in an expansion/retention layer adjacent the substrate. The permanent and user-supplied information may be read via laser beams having unequal wavelengths.