Appeal No. 1996-4200
Application No. 08/330,341
said first and third MOSFETs each being a depletion MOSFET;
and
all of said MOSFETs being of the same channel type and all of
said MOSFETs having a bulk terminal connected to said second
terminal for the supply voltage.
The references relied on by the examiner are:
Van Zeghbroeck 4,771,194
Sept. 13, 1988
Leipold et al. (Leipold) 5,434,521 July
18, 1995
(filed Nov. 19,
1992)
Claims 1 and 4 stand rejected under 35 U.S.C. § 103 as
being unpatentable over Leipold in view of Van Zeghbroeck.
Reference is made to the brief and the answer for the
respective positions of the appellants and the examiner.
OPINION
The obviousness rejection of claims 1 and 4 is reversed.
The examiner acknowledges (Answer, page 3) that Leipold
differs from the claimed invention in that Leipold uses "CMOS
field effect transistors, while the appellants’ invention uses
four MOSFETS of the same channel type, i.e., n-type FETs."
Leipold does not disclose the type of transistors used in his
circuit [but we presume that they are all of the enhancement
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