Appeal No. 94-0105
Application 07/854,124
N-YBaCuO as the weak link barrier layer. To remedy this 3
defect, the examiner argues:
However, Gao et al disclose (see page 127, col.
1, lines 1-4) that PBCO has similar lattice4
constants as YBCO (Note: Both PBCO and N-YBCO have a
perovskite crystal structure).
Furthermore, both Y and Pr are rare earth
elements. Therefore, the normal conduction PBCO of
Gao et al is similar to the claimed N-YBCO not only
in lattice constants but also in chemical and
electrical properties (i.e. both are non-
superconducting or normal conducting).
It would have been obvious to one of ordinary
skill in the art at the time the invention was made
to have substituted the PBCO by N-YBCO as a weak
line [sic: link] barrier layer in Gao et al’s SNS5
edge Josephson junction because the substitution of
art recognized equivalents would lead to the
expected success.
Revised Examiner’s Answer, Paper No. 18, at pages 3 to 4
(underscored emphasis original, italicized emphasis added).
3Appellant appears to agree with this characterization,
with the further objection that Gao does not disclose the
deposition of the upper superconducting YBaCuO layer on a N-
YBaCuO barrier layer. Brief, Paper No. 12 at page 9.
4“PBCO” stands for PrBaCuO, wherein Pr, praseodymium,
has been substituted for Y, yttrium.
5SNS is an acronym for “superconducting-normal metal-
superconducting” sandwich structures, which are one form of
Josephson junction. Specification at page 2, lines 17-22.
5
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 Next
Last modified: November 3, 2007