Appeal No. 1997-0274
Application No. 08/266,912
pump circuit for each transition, Tatsumi clearly teaches a basic clock doubling circuit
which provides a full cycle signal for each transition from low to high and high to low. (See
Tatsumi at Figure 3.)
In rejecting claims under 35 U.S.C. § 103, the Examiner bears the initial burden of
presenting a prima facie case of obviousness. See In re Rijckaert, 9 F.3d 1531,
1532, 28 USPQ2d 1955, 1956 (Fed. Cir. 1993). A prima facie case of obviousness is
established by presenting evidence that the reference teachings would appear to be
sufficient for one of ordinary skill in the relevant art having the references before him to
make the proposed combination or other modification. See In re Lintner, 458 F.2d 1013,
1016, 173 USPQ 560, 562 (CCPA 1972). Furthermore, the conclusion that the claimed
subject matter is prima facie obvious must be supported by evidence, as shown by some
objective teaching in the prior art or by knowledge generally available to one of ordinary
skill in the art that would have led that individual to combine the relevant teachings of the
references to arrive at the claimed invention. See In re Fine, 837 F.2d 1071, 1074, 5
USPQ2d 1596, 1598 (Fed. Cir. 1988).
The Examiner states that “it would have been obvious for one skilled in the art to
add the doubling circuit of Tatsumi between the oscillator signal (within OSC) and the
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