Appeal 2007-0380
Reexamination Control 90/007,199
Patent 6,394,644 B1
Duke
11. Duke teaches a mixer made from “mixing plates 2 which are placed
on top of one another and welded together….” (Duke 3).
12. Figure 1 of Duke, below, illustrates a mixing plate:
13. Figure 1 shows bars 4, mixing passageways between the bars 3, a
transverse rib 5, an axial notch 11 and an end ring 1.
14. Duke states that the “[m]ixing plates 2 [numeral not shown in figure]
are advantageously produced by the precision casting method, and in
such a way that axial mixing passageways 3 are provided in the gaps
5
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