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. 26, 1989
Filed:
Aug. 15, 1986
Applicant:
Inventors:
Jerome Drexler, Los Altos Hills, CA (US);
Eric W Bouldin, Atherton, CA (US);
Assignee:
Drexler Technology Corporation, Mountain View, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06K / ; G11B / ; G11B / ;
U.S. Cl.
CPC ...
235454 ; 235487 ; 369 54 ; 369 58 ; 369 84 ;
Abstract
A method for extending the life of information recorded on an optical storage medium, such as direct-read-after-write laser recording material. Information and an index are recorded on the medium. When the optical contrast ratio of the recording begins to deteriorate, when a specified error rate in reading data bits occurs, or after a predetermined time elapses, the information is re-recorded at another location on the medium and a new index entry is added.