Appeal No. 97-0503
Application 08/218,102
1. Apparatus for comparing corresponding acoustical
resonances in liquids, which comprises in combination:
a. first transducer means for applying a continuous
periodic acoustical signal to the outside of a receptacle
containing the liquid;
b. means for sweeping said first transducer means
through a chosen frequency range;
c. second transducer means located on the same side of
the receptacle as said first transducer means and in the vicinity
thereof, for receiving the acoustical signal generated in the
sample; and
d. means for measuring the resonant frequencies
received by said second transducer means.
The Examiner’s Answer cites the following prior art:
Pope et al. (Pope) 5,359,541 Oct. 25, 1994
Johnston et al. (Johnston) 5,426,977 Jun. 27, 1995
OPINION
The claims stand rejected under 35 U.S.C. § 103 as
unpatentable over Johnston or Pope. The claims recite apparatus
for comparing acoustical resonances in liquids, employing two
transducers in the vicinity of one another on the same side of a
container. Johnston and Pope each disclose similar apparatus
whose two transducers are on opposite sides of the container.
According to the examiner, placing the transducers on the same
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