Appeal No. 1998-1901
Application 08/506,804
Cadet. Anticipation is established only when a single prior
art reference discloses, expressly or under the principles of
inherency, each and every element of a claimed invention as
well as disclosing structure which is capable of performing
the recited functional limitations. RCA Corp. v. Applied
Digital Data Systems, Inc., 730 F.2d 1440, 1444, 221 USPQ 385,
388 (Fed. Cir.), cert. dismissed, 468 U.S. 1228 (1984); W.L.
Gore and Associates, Inc. v. Garlock, Inc., 721 F.2d 1540,
1554, 220 USPQ 303, 313 (Fed. Cir. 1983), cert. denied, 469
U.S. 851 (1984).
Each of claims 1 and 14 recites a device or step of
generating “a first analog signal which is logarithmically
proportional to the photoelectric signal.” Appellant argues
that there is no logarithmic conversion disclosed in Cadet.
The examiner argues that the output of photodiode 2 is
inherently a logarithmic function of the input, or current to
voltage
converter 5 has a logarithmic response, or phase sensitive
detector 6 achieves a logarithmic response by selection of the
gain of programmable gain amplifier 22.
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