Appeal No. 1999-0418 Page 8
Application No. 08/517,036
virtue of the large capacitance of the ferroelectric layer
18." Id. Capacitance is directly proportional to the
"dielectric constant" or "relative permittivity" of a
material. Because the dielectric constant of barium nitrate
"lies in the range of 2000-4500,"
A. J. Moulson and J. M. Herbert, Electroceramics 244
(1990)(copy attached), Arnett requires a material with such a
dielectric constant in the range of 2000-4500.
Although Paz discloses layered superlattice materials,
the materials lack a large dielectric constant. The reference
teaches materials having dielectric constants no greater than
166. Specifically, "[t]he BaBi Ta O was not a switching
2 29
ferroelectric, but was a paraelectric with a dielectric
constant of 166 at 1 megahertz." Col. 30, ll. 60-61. Paz's
dielectric constant of 166 is twelve times smaller than the
Arnett's minimum requirement of 2000.
Because Paz's dielectric constant of is twelve times
smaller than Arnett's minimum requirement, we are not
persuaded that Paz's layered superlattice material would have
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 Next
Last modified: November 3, 2007