Azo dye compound, coloring composition, ink sheet for...

Radiation imagery chemistry: process – composition – or product th – Radiation modifying product or process of making – Screen other than for cathode-ray tube

Reexamination Certificate

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Details

C430S108230, C430S200000, C008S692000, C106S031500, C347S100000, C534S753000

Reexamination Certificate

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07838184

ABSTRACT:
An azo dye of the following formula:wherein R1, R2, R4and R5represent a hydrogen atom or a substituent; R3and R6each independently represent a substituent; n indicates 0 to 3. The dye has an excellent optical characteristic with sharp absorption and excellent fastness.

REFERENCES:
patent: 4764178 (1988-08-01), Gregory et al.
patent: 5079213 (1992-01-01), Chapman et al.
patent: 7141657 (2006-11-01), Fujita et al.
patent: 7648943 (2010-01-01), Fujiwara et al.
patent: 2-207273 (1990-08-01), None
patent: 2-207274 (1990-08-01), None
patent: 3-276161 (1991-12-01), None
patent: 4-265797 (1992-09-01), None

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