Appeal No. 95-3779
Application No. 08/191,063
which have discernible layouts, which look alike to a reverse
engineer, but with dopant implant interconnections that are not
discernible by reverse engineering.
Representative independent claim 1 is reproduced as follows:
1. A secure integrated circuit (IC), comprising:
a semiconductor substrate,
at least two logic circuits of different types formed in
said substrate with layouts which make said two logic circuits
look alike to a reverse engineer, each logic circuit having doped
IC elements, and
an interconnect for at least one of said elements, said
interconnect comprising a dopant implant in said substrate of
like conductivity to said element, and providing an electrical
signal path to interconnect said element with another portion of
the IC, said dopant implant being substantially not discernible
by reverse engineering techniques.
The examiner relies on the following references:
Koeppe 4,799,096 Jan. 17, 1989
Kuwana 5,138,197 Aug. 11, 1992
(filed May 22, 1991)
Sawase (JP) 58-190064 Nov. 5, 1983
Claims 1 through 15 and 21 stand rejected under 35 U.S.C.
' 112, first paragraph, under the written description provision
of that statutory section as being based on a specification that
allegedly fails to provide support for the invention as is now
claimed.
Claims 1 through 15 and 21 also stand rejected under
35 U.S.C. ' 103 as unpatentable over Kuwana.
2
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