Appeal No. 1999-0056
Application No. 08/734,431
unrecorded layer is such that the real part of the refractive
index (n) at 780 nm, is not less than 1.8, and the imaginary
part (k) is not greater than 0.15 and (b) the recording layer
comprises one or more tetra dyes having a metallized azo
dianionic dye with cationic dye counterions and (c) the
recording layer thickness from 225 to 300 nanometers.
The examiner relies upon the following references as
evidence of obviousness:
Howe et al. (Howe) 4,577,306 Mar. 18, 1986
Namba et al. (Namba) 4,735,889 Apr. 5, 1988
Kovacs et al. (Kovacs) 5,272,047 Dec. 21, 1993
Chapman et al. (Chapman) 5,426,015 Jun. 20, 1995
Shuttleworth et al. 5,547,727 Aug. 20, 1996
(Shuttleworth) (filed Dec. 13, 1994)
Douglas A. Skoog et al. (Skoog), Principles of Instrumental
Analysis 150-52 (Saunders College/Holt, Rinehart and Winston
1980)
Appellants' claimed invention is directed to an optical
recording element wherein the recording layer comprises one or
more tetra dyes having a metallized azo dianionic dye with
cationic dye counterions, and has a thickness in the range of
225-300 nanometers. According to appellants, "[t]he tetra
dyes, including mixtures of such dyes, together with thicker
recording layers provide improved laser recording sensitivity
and superior recording layer performance" (page 2 of Brief,
last paragraph).
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