Ex parte SHORT et al. - Page 4
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Board of Patent Appeals and Interferences > 1997 > Ex parte SHORT et al. - Page 4
Appeal No. 95-2867 Page 4
Application 07/744,324
signal producing circuit 15 as providing acts equivalent to
Appellants' detecting step. (Paper 9 at 2-3.)
B. Claims 34 and 39 were anticipated
6. Inoue's filter 11 passes through only signals from the
antenna that correspond to a desired frequency band. (3:12-21.)
This output passes via the intermediate frequency (IF) stage 12 to
the squelch signal producing circuit 15. (4:18-23.) The squelch
signal producing circuit 15 includes a detector 151 that produces an
envelope signal based on the IF signal. The envelope signal passes
to the comparator 152, which compares the envelope signal to a
reference signal to produce the squelch signal. (3:50-62.)
7. The acts performed by Appellants' narrow passband filter 36
and Inoue's RF band-pass filter 11 (or IF BPF 123) are equivalent.
Both are described as passing a specified frequency band.
8. The acts performed by Appellants' detector 38 and Inoue's
voltage comparator 152, 152a in his squelch signal producing
circuit 15 are equivalent. Appellants' detector 38 may be no more
than a comparator 46 with a threshold voltage input 48. (Fig. 2;
Paper 1 at 11:29-33.) Thus, fundamentally, Appellants "detect[] the
closer equivalent to Appellants' narrow bandpass filter 36.
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Last modified: November 3, 2007
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