US Patent No: 6,982,109

Number of patents in Portfolio can not be more than 2000

Method for rendering surface layer of limited play disk lightfast

ALSO PUBLISHED AS: 20020102499

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Abstract

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An optically readable media (10) has an information-encoding layer (16) and at least one color-forming layer (12) that embodies an optical readout-limiting mechanism. In a first embodiment the at least one color-forming layer contains an additive that does not interfere with the optical readability of the media for a duration of a readout period. The additive, upon exposure to a source of optical radiation that is suitable for reversing the color-forming layer from an optical readout inhibiting state to an optical readout enabling state, undergoes a transformation that maintains the color-forming layer in the optical readout inhibiting state. More specifically, exposure to the source causes the color-forming layer to photobleach and the additive to oxidize, where the oxidation of the additive permanently inhibits the optical readability of the media. The additive may be a leuco dye. In one embodiment the color-forming layer is comprised of 3-[2,2-bis(4-diethylaminophenyl)vinyl]-6-dimethylaminophethalide and the additive is comprised of benzoyl leucomethylene blue. In a further embodiment the additive is placed into a protective layer (18) that overlies the color-forming layer.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
FLEXPLAY TECHNOLOGIES, INC.NEW YORK, NY27
SPECTRADISC CORPORATIONPROVIDENCE, RI1

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Krieg-Kowald, Marianne Barrington, RI 13 72

Cited Art Landscape

Patent Info (Count) # Cites Year
 
FLEXPLAY TECHNOLOGIES, INC. (5)
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6,511,728 Pseudo-transmissive read inhibitor for optical storage media 48 2000
6,434,109 Machine-readable optical disc with reading-inhibit agent 44 2001
6,756,103 Limited play optical devices with interstitial reactive layer and methods of making same 48 2002
 
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5,572,589 Disc serialization 56 1993
 
Mikoh Pty Ltd (1)
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The United States of America as represented by the Secretary of Agriculture (1)
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5,627,287 Phthalide compound and a near infrared absorber and a recording material each comprising the same compound 3 1995
 
Other [Check patent profile for assignment information] (6)
4,584,641 Copyprotecting system for software protection 209 1983
4,734,796 Technique for preventing unauthorized copying of information recorded on a recording medium and a protected recording medium 45 1983
4,980,782 Software protection and identification system 112 1985
5,267,311 Intelligent diskette for software protection 56 1992
5,322,747 Method of manufacturing an optical disc 23 1993
5,507,947 Centrifugal apparatus for separating particulate material 4 1994

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