Appeal 2007-2359
Application 90/006,951
56. Accordingly, we shall treat WO and EP as cumulative and cite the EP
disclosure exclusively.
57. EP relates to "intermediate strength extrudable AlMgSi alloys" having
the following compositions in weight %:
Mg 0.25 – 0.40
Si 0.60 – 0.90
Mn 0.10 to 0.35; and up to 0.35
Fe up to 0.35
others up to 0.05 each, 0.15 total
Al balance.
(EP at 2:15–21.)
58. According to EP, the "nominal composition" of its inventive
composition is:
Mg 0.35 Si 0.70 Fe 0.2.
(EP at 2:39-50.)
59. EP explains that a "balanced alloy" is "one in which just enough Si is
present to combine with all the Mg, Fe, Mn as Mg2Si and Al(Fe,Mn)Si."
(EP at 2:41–42.)
60. Thus, EP's inventive alloys are said to be "high excess Si alloys." (EP
at 2:39–40.)
61. Preferred compositions are described as having excess Si of at
least 0.3%. (EP at 3:27–29.)
62. According to EP, if the Mg content is too low, it is hard to achieve the
required strength in aged extrusions, while if the Mg content is too high, the
extrusion pressure becomes unacceptably high. (EP at 3:9–11.)
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