Information recording medium

Details Information recording medium Information recording medium

2005-02-01

2005-02-01

Mulvaney, Elizabeth (Department: 1774)

Stock material or miscellaneous articles

Circular sheet or circular blank

C428S064400, C428S064800, C430S270140

Reexamination Certificate

active

06849316

ABSTRACT:
An information recording medium showing a high light-resistance has a recording layer containing a dye compound having the following formula (I-1) or (I-2):in which each of A1, A2, B1and B2is a substituent; each of Y1and Z1is a group of atoms required for forming a carbon ring or a heterocyclic ring; each of E and G is a group of atoms required for forming a conjugated double bond chain; X1is ═O, ═NR or ═C(CN)2, wherein R is a substituent; X2is —O, —NR or —C(CN)2, wherein R is a substituent; each of L1, L2, L3, L4and L5is a methine group which may have a substituent; Mk+is an onium ion containing a positively charged onium atom to which no hydrogen atom is attached; each of m and n is 0, 1 or 2; each of x and y is 0 or 1; and x is an integer of 1 to 10.

REFERENCES:
patent: 3502474 (1970-03-01), Momotoshi et al.
patent: 3867149 (1975-02-01), Furuya et al.
patent: 3933798 (1976-01-01), Curtis et al.
patent: 4497888 (1985-02-01), Nishioka et al.
patent: 6670475 (2003-12-01), Wariishi et al.
patent: 6713147 (2004-03-01), Morishima et al.
patent: 20040043326 (2004-03-01), Saito et al.
patent: 63209995 (1988-08-01), None
Nishioka et al., (CA 101:15059, DE 3322684).
Furuya et al., (CA 80:42921, DE 2322275).
Tsuda et al., (CA 73:30645, US 3502474).
Furuya et al., (CA 75:8877, US 3867149).
Nishioka et al., (CA 85:7669, abstract of US Patent 4497888).
Yamauchi et al., (CA 120:311306).

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