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US5230930A Expired / Lapsed US ⏱️ 0.0 years remaining

Method of fabricating a high-density magnetooptic recording medium

Assignee: Sony Corp
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Filing: 1992-02-07
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Granted: 1993-07-27
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Expires: 2012-02-07
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Abstract

Abstract A method of fabricating a magnetooptic recording medium (10) having at least a reproducing layer (11) and a recording layer (13), from which information is read out by changing the state of magnetization of the reproducing layer (11) comprises steps of forming the reproducing layer (11) on a substrate (21), putting a high-density magnetic recording medium (30) storing information in a high-density magnetic pattern into close contact with the reproducing layer (11) to copy the high-density magnetic pattern formed on the high-density magnetic recording medium (30) into the reproducing layer (11), and forming the recording layer (13) over the reproducing layer (11) after copying the high-density magnetic pattern into the reproducing layer, to copy the high-density magnetic pattern into the recording layer (13).

Inventors

  • 👤 Katsuhisa Aratani
  • 👤 Masahiko Kaneko
  • 👤 Masumi Ohta
  • 👤 Isamu Nakao

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 21:39
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/10582

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 117 words
A method of fabricating a magnetooptic recording medium having at least a reproducing layer and a recording layer, from which information recorded on the recording layer is read out by changing the state of magnetization of the reproducing layer, said method comprising steps of: forming the reproducing layer on a substrate; forming a high-density magnetic pattern representing information by putting a magnetic recording medium storing the information in a high density in the magnetic pattern in close contact with the reproducing layer to copy the magnetic pattern into the reproducing layer; and forming a recording layer over the reproducing layer after storing the information on the reproducing layer, to magnetize the recording layer in the magnetic pattern.
Claim 2
Independent Claim 117 words
A method of fabricating a magnetooptic recording medium having at least a reproducing layer and a recording layer, from which information recorded on the recording layer is read out by changing the state of magnetization of the reproducing layer, said method comprising steps of: forming the reproducing layer on a substrate; forming a high-density magnetic pattern representing information by putting a magnetic recording medium storing the information in a high density in the magnetic pattern in close contact with the reproducing layer to copy the magnetic pattern into the reproducing layer; and forming a recording layer over the reproducing layer after storing the information on the reproducing layer, to magnetize the recording layer in the magnetic pattern.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1996-07-26 1997-01-25 1997-07-27 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2000-07-26 2001-01-25 2001-07-27 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2004-07-26 2005-01-25 2005-07-27 $7700.00 Window Closed / Lapsed

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