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:
Jul. 07, 1987
Filed:
Mar. 07, 1986
Mark H Kryder, Allegheny, PA (US);
Han-Ping D Shieh, Pittsburgh, PA (US);
General Electric Company, Schenectady, NY (US);
Abstract
Methods for directly over-writing the binary data value of a bit of digital data, stored in a particular one of a multiplicity of microscopic storage regions of a thin-film magneto-optic recording layer, first locate the storage region and non-destructively read the stored data value therefrom, and then compare the recovered value against the data value of an information bit to be stored in the same storage region. If the comparison indicates that no change in the stored data value is required, then the process proceeds to read and compare the next bit of data, from the next associated storage location. If the comparison indicates that a reversal of the magnetic moment of that region is required to store the new data value, a source of energy is energized to heat the particular storage region of a sufficiently high temperature that the self-demagnetization field of the recording layer material inverts the net magnetic moment of that region. Multiple over-writing of the long-term stable stored data values can be provided.