Appeal No. 1999-1742
Application No. 08/730,674
said second electrical signal provided by said signal means and
said electrical return signal to provide a beat signal having a
beat frequency, and means coupled to receive said beat signal
for determining the presence of said identifier means when a
predetermined beat frequency is received for at least a
predetermined duration after the termination of said transmitted
electromagnetic signal and providing a signal indicative
thereof.
Independent claim 9 is directed to a method for sensing the
presence of an object comprising, inter alia, the steps of
providing an electromagnetic return signal from an identifier
means secured to the object in response to a transmitted
electromagnetic signal, the electromagnetic return signal having
a first frequency, providing a signal at a second frequency,
different from the first frequency, mixing signals having the
first frequency from the return signal and the second frequency
to provide a beat signal having a beat frequency, determining
the presence of the identifier means when a predetermined beat
frequency in the beat signal is present, and providing a signal
indicative of the presence of the identifier means.
To support the rejection of claims 1 through 20 under
-5-5
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