Stock material or miscellaneous articles – Circular sheet or circular blank
Reexamination Certificate
2008-01-08
2008-01-08
Mulvaney, Elizabeth (Department: 1774)
Stock material or miscellaneous articles
Circular sheet or circular blank
C428S064400, C428S064800, C430S270140
Reexamination Certificate
active
07316836
ABSTRACT:
An optical recording medium comprises a transmission substrate and a recording layer formed on the transmission substrate, the recording layer containing at least a dye material expressed by a general formula shown at the following chemical formula (in the chemical formula 1, R1 represents alkyl group having carbon numbers 1 to 4, R2, R3 represent alkyl group having carbon numbers 1 to 4, benzyl group or groups combined to form 3 to 6 rings, Y1 and Y2 independently represent organic groups and X represent ClO4, BF4, PF6, SbF6) and a dye material expressed by a general formula represented by the following chemical formula 2(in the chemical formula 2, R1 and R2 represent alkyl groups having carbon numbers 1 to 4, benzyl groups or groups combined to form 3 to 6 rings, Y1, Y2 independently represent organic groups and X represent ClO4, BF4, PF6, SbF6):In a write once type optical recording medium such as DVD−R and DVD+R, satisfactory recording characteristics can be obtained from low-speed recording to high-speed recording.
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Patent Abstracts of Japan, JP 2003-231359, Aug. 19, 2003.
Akimori Toshihiro
Oya Keiji
Shigeno Koichi
Shimada Junko
Suwabe Masatsugu
Mulvaney Elizabeth
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Sony Corporation
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