Appeal No. 2000-1076
Application No. 09/084,904
The subject matter on appeal relates to an optical
recording element having a recording layer which comprises a
metallized
azo thioether dye having an azo group linking a substituted
3-hydroxypyridine nucleus to a phenyl nucleus wherein the
phenyl nucleus has a thioether substituent ortho to the azo
group and the phenyl nucleus is free of electron withdrawing
groups. Further details concerning this appealed subject
matter are set forth in representative independent claim 5
which reads as follows:
5. An optical recording element having a
transparent substrate and on the surface of said
substrate, a recording layer, a light reflecting layer;
wherein the recording layer comprises a metallized azo
thioether dye having an azo group linking a substituted
3-hydroxypyridine nucleus to a phenyl nucleus wherein the
phenyl nucleus has an thioether substituent ortho to the
azo group and is free of electron withdrawing groups on
the phenyl ring and has, when unrecorded, a refractive
index at a selected wavelength from 400 to 660 nm,
comprising a real part (n) greater than 1.8 and an
imaginary part (k) less than 0.3.
The references set forth below are relied upon by the
examiner as evidence of obviousness:
Ichikawa et al. (Ichikawa) 4,906,498 Mar. 6,
1990
Takahashi et al. (Takahashi) 4,939,011 Jul. 3,
1990 Chapman et al. (Chapman) 5,500,325 Mar.
2
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