Appeal No. 2004-1962
Application No. 09/996,415
temperature of its bias-level heating arrangement is preset.
Brief, pages 7-8.
The examiner relies upon Soden for teaching the use of two
separate power supplies. As shown by Soden, Figure 5 shows one
embodiment very similar to that disclosed in Spahn. Figure 5
shows items 47 and 51 being in intimate contact with each other
just as top plate 20 of Spahn can be in intimate contact with
electrical flanges 11 and 13, as shown in Figure 6 of Spahn.
In the embodiment of Figure 5 of Soden, Soden teaches that
a single heating source can be employed. See col. 21, line 66
through col. 22, line 41. In the very same column, Soden
teaches an alternative embodiment that can be employed, shown in
Figure 7. Figure 7 shows that surface 47 and crucible 51 can
each be coupled to independent heat sources thereby enabling
independent control of the temperature. Soden teaches that this
embodiment has advantages that include reduced evaporation times
and lowered temperature requirements for the heating of the
selenium within the crucible.
Also, as pointed out by the examiner on page 8 of the
answer, Soden discusses a problem associated with utilizing a
single source heater which is that surface 47 may initially be
at temperature significantly hotter than the body of the
crucible 51 since the surface 47 is not in contact with material
60, and since contact with material 60 slows heating of crucible
51. See col. 22, lines 23 through 29 of Soden. The examiner
then goes on to say that in Soden’s second embodiment, wherein
independent heater controls are utilized to heat the crucible 51
and surface 47, such excess temperature at surface 47 is
avoided.
5
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