Method for rendering surface layer of limited play disk lightfast

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO

6982109

APP PUB NO

20020102499A1

SERIAL NO

10016103

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ATTORNEY / AGENT: (SPONSORED)

Importance

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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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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
FLEXPLAY TECHNOLOGIES, INC.NEW YORK, NY2
SPECTRADISC CORPORATIONPROVIDENCE, RI0

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Krieg-Kowald, Marianne Barrington, RI 10 87

Cited Art Landscape

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* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
SABIC INNOVATIVE PLASTICS IP B.V. (1)
* 2005/0050,571 Limited-play recordable data storage media and associated methods of manufacture 24 2003
 
CONSUMABLE MEDIA LLC (1)
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FLEXPLAY TECHNOLOGIES, INC. (1)
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* Cited By Examiner

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