Method for rendering surface layer of limited play disk...

Details Method for rendering surface layer of limited play disk... Method for rendering surface layer of limited play disk...

2008-05-20

2008-05-20

Mulvaney, Elizabeth (Department: 1774)

Stock material or miscellaneous articles

Circular sheet or circular blank

C428S064400, C428S064800, C430S270140

Reexamination Certificate

active

07374804

ABSTRACT:
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-dimethylaminophthalide 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.

REFERENCES:
patent: 5963536 (1999-10-01), Vasic et al.
patent: 6589626 (2003-07-01), Selinfreund et al.
patent: 6756103 (2004-06-01), Thompson et al.
patent: 6790501 (2004-09-01), van de Grampel et al.

Affiliated with

Also associated with

Rating

Method for rendering surface layer of limited play disk... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for rendering surface layer of limited play disk..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for rendering surface layer of limited play disk... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2779781