Appeal No. 96-3997
Application No. 08/173,953
(1988); Ashland Oil, Inc. v. Delta Resins & Refractories,
Inc.,
776 F.2d 281, 293, 227 USPQ 657, 664 (Fed. Cir. 1985), cert.
denied, 475 U.S. 1017 (1986); ACS Hospital Systems, Inc. v.
Montefiore Hospital, 732 F.2d 1572, 1577, 221 USPQ 929, 933
(Fed.
Cir. 1984). These showings by the Examiner are an essential
part
of complying with the burden of presenting a prima facie case
of
obviousness. Note In re Oetiker, 977 F.2d 1443, 1445, 24
USPQ2d
1443, 1444 (Fed. Cir. 1992).
We note that each of the independent claims 6, 8, and 9
recites the construction of a bipolar diode in which a
subsurface breakdown region is implanted below the surface of
an epitaxial layer. The relevant portion of independent claim
6 (similar recitations of which appear in independent claims 8
and 9) recites:
wherein said second impurity region is
formed in a region shallower than a buried
layer of the first conductivity type formed
7
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