Appeal no. 97-1293
Application no. 08/281,812
e. Preceramic organosilicon polymers made from monomers of
dimethyl siloxane and diphenyl siloxane (col. 3, lines 18-39).2
f. Sintering temperatures up to 2000EC (col. 10, lines 23-39), a
preferred maximum of 1,800EC (col. 9, line 3), and Example
10 with 1,900EC.
3
The highest bulk density in an example of 3.06 g/cm for a sintered
body (Example 3).
With respect to the claimed invention, the reference does not teach:
A sintering temperature “greater than 2000EC”.
3
A sintered body with a density greater than about 4.0 g/cm .
The rejection and issues on appeal
The examiner rejected claims 1-10 under 35 USC § 103(a) as being unpatentable
over Lukacs in view of Yajima. The examiner states, at pp. 4 and 5 of his November 27,
1996 Answer, that Lukacs teaches a method comprising the steps of mixing a ceramic
powder and organosilicon polymer, such as polysiloxanes and polysilazanes, forming the
mixture into a green body, and sintering the green body.
2Compare, p. 5, lines 11-14, of the present specification. Dimethyl siloxane is Me SiO and diphenyl
2
siloxane is Ph SiO.
2
6
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