Appeal No. 1996-3121
Application No. 08/115,783
principally concerned with the formation of diamond films
possessing “high hardness” as coatings for the super hard
metal substrates such as tungsten carbide, the thermal
conductivity of the CVD produced diamond is a property of
interest to Yamazaki. See column 5, lines 49-51 of Yamazaki.
As appellants acknowledge in their specification at page 1,
lines 15-18, and page 2, lines 1-3, because diamond has a
“very large coefficient of thermal conductivity”, it is
especially useful as a heat sink for integrated circuits and
laser diodes. Accordingly, in light of the relevant
disclosures in Seitz and motivated by the goal of enhancing
the thermal conductivity of Yamazaki’s CVD diamond films, one
of ordinary skill in this art would have been led to use an
isotopically pure source of carbon 12 or carbon 13 in
Yamazaki’s CVD process to achieve this goal. Notwithstanding
appellants’ arguments in this record relating to the different
methodology utilized by Seitz, we know of no technical reason8
why one of ordinary skill in this art would not have a
8There is no objective evidence of record to show how or
why low pressure as utilized in a CVD process would adversely
affect a carbon isotope in such a process.
9
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