Appeal 2007-2359
Application 90/006,951
26. The homogenized ingot is then extruded and aged at elevated
temperatures to attain peak strength. (359 patent at 4:40-67.)
Reiso
27. Reiso indicates that, in 1984, it was generally accepted that Mg and Si
content, as well as the homogenization process used, affected the
extrudability of AlMgSi alloys. (Reiso at 31, col. 1.)
28. According to Reiso, the literature was "somewhat contradictory," and
his goal was to clarify the influence of Mg and Si and the cooling rate after
homogenization on the extrudability of these alloys. (Reiso at 31, col. 1.)
29. Reiso presents studies of three series of alloys, I, II, and III.
30. In Series I, the Mg content was held constant at about 0.40, while the
Si content was varied between 0.29 and 0.98 (alloys 1–5); and then the Si
content was held constant at about 0.43 while the Mg content was varied
from 0.30 to 0.70 (alloys 6–10). (Reiso at 33, Table 1.)
31. Alloy 6 in Series I has Mg of 0.30, Si of 0.43, and Fe of 0.21. (Reiso
at 33, Table 1.)
32. In Series II, the Mg content was held constant at about 0.50 while the
Si content was varied between 0.31 and 0.98; then the Si content was held
constant at about 0.50 while the Mg content was varied between 0.28
and 0.78. (Reiso at 33, Table 1.)
33. Alloy 16 in Series II has Mg of 0.28, Si of 0.48, and Fe of 0.19.
(Reiso at 33, Table 1.)
34. All other alloys reported by Reiso have an Mg content of 0.39 or
greater. (Reiso at 33, Table 1.)
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