Appeal No. 1996-3121
Application No. 08/115,783
decomposing and reacting a reaction gas containing
carbon atoms, hydrogen atoms, oxygen atoms and nitrogen gas, a
concentration of carbon atoms in relation to hydrogen gas
being (A%), a concentration of nitrogen gas in relation to the
whole reaction gas being (B ppm), and a concentration of
oxygen atoms in relation to the hydrogen gas being (C%), the
amounts of A, B and C satisfy the equation:
" = (B) x (A - 1.2C)½
wherein " is not larger than 13 or B is not larger than 20,
and wherein said carbon atoms comprise 99.9% or more of C or12
13C.
13. A synthetic diamond which is formed by a CVD method
on a substrate made of a material selected from the group
consisting of copper-tungsten alloy, gold, silver, copper
aluminum, a ceramic and a synthetic Ib type diamond single
crystal, wherein at least 99.9% of carbon in the synthetic
diamond comprises at least one carbon isotope selected from
12 13
the group consisting of C and C, a nitrogen content in the
synthetic diamond is less than 20 ppm, and a ratio of a peak
height of non-diamond carbon to that of diamond in the Raman
spectroscopic spectrum of the synthetic diamond is not larger
than 0.07.
As evidence of obviousness of the claimed invention, the
examiner relies on the following references:
Seitz 3,895,313 Jul. 15, 1975
Sakamoto et al. (Sakamoto) 4,725,345 Feb. 16, 1988
Yamazaki 5,015,494 May 14, 1991
A reference relied upon by appellants is:
2
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Next
Last modified: November 3, 2007