Appeal No. 1998-1603 Page 7
Application No. 08/428,940
transducer in contact with the subject’s
head, while monitoring the standing wave
characteristics of the signal received on
the second, receiving transducer, likewise
in contact with the subject’s head (both,
typically on the forehead). One such
characteristic is the phase difference
between these two signals at a chosen
frequency which has been found to be
related to the intracranial pressure and
changes therein. [Specification at page 4].
The specification further discloses that if a frequency
corresponding to the skull bone resonance is selected, effects
of stress due to change in ICP are substantially magnified and
further discloses the method of the invention thusly:
Once any one of the several resonance
frequencies are found, that particular
frequency is kept fixed and only the phase
output is monitored. [Specification at page
5].
In view of the disclosure in the specification, it is our view
that the language “choosing a frequency for said step of
ultrasonic, oscillatory excitation such that the detected
vibration corresponds to a resonance in the skull bone” of
claim 1 does indeed indicate that a single frequency be
applied to the skull bone.
Mick does not disclose the application of a single
frequency excitation nor does it disclose the measurement of
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