Appeal No. 1996-3121
Application No. 08/115,783
gas which includes, inter alia, essentially isotopically pure3
12 13
carbon atoms which comprise “99.9% or more of C or C”,
hydrogen atoms, oxygen atoms, and nitrogen gas. Additionally,
the concentration of the carbon atoms, the oxygen atoms, and
the nitrogen gas must satisfy an equation set forth in the
appealed method claims (see appealed claim 1 above) wherein "
is not larger than 13. Alternatively, according to claim 1,
the nitrogen gas is not larger than 20 ppm based on the total
reaction gas present. Significantly, appellants disclose that
by increasing the purity of carbon isotope utilized in the
claimed method, diamond having an a higher coefficient of
thermal conductivity is produced. See the specification at
pages 16 and 17. This makes the diamond layer or film
produced by the claimed method more desirable, when, for
example, it is used as a heat sink for a high output
integrated circuit or a laser diode. See the specification at
page 2, lines 1-3.
3Sources of carbon for appellants’ process include, inter
alia, methane and ethanol. See example 3 in the specification
at page 13.
4
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