Changing light absorption by disruption of conjugation
AssigneeVerification Technologies, Inc.
InventorRichard Selinfreund
Life of this patent
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Abstract
Copy-protected optical medium utilizing a composition comprising a transient optical state change security materials constrained to change the optical state light absorption at a wavelength of about 400 nm and an electron transfer agent.
Claims10
A method comprising the steps of:
- (a) disrupting the conjugation in a methylene blue analogous dye molecule so as to move light absorption to a higher energy level or shorter wavelength;
- (b) placing the dye of step (a) onto or into an optical medium.
A transient optical state change security material capable of shifting to an activated state having an absorption at about 400 nm comprising a compound of formula I:
- where R1, R2 are electron withdrawing and R3, R4 are electron donating groups.
A high definition DVD comprising a transient optical state change security dye composition which is cross-linked with a substrate affording a constraint on the planar structure of the dye shifting its light absorption capacity to about 400 run.
A compound capable of an absorption at 400 nm comprising formula II:
- where the radicals R1 and R2 are electron withdrawing groups.
An optical medium comprising a reversible transient optical state change material having a phenothiazine backbone in association with an electron transfer agent;
- wherein the material transiently changes optical state when exposed to a wavelength of about 400 nm to about 780 nm.
Dependencies are inferred from the claim text.