Appeal 2006-3308
Application 10/726,181
2) Brusethaug states that a goal is “to eliminate the fir-tree structure,
or at least to keep the zone width consistently smaller than the scalping
depth.” (p. 472, col. 2, first para.).
3) According to Brusethaug, “[s]ince the nucleation and growth of Al
Fe require high cooling rates formation of the fir-tree structure will be
promoted by a high casting speed.” (p. 473, col. 1, first para.).
4) Brusethaug notes that “wide fir-tree zones also appear at low
casting speeds suggesting that other factors in addition to casting speed
and Fe and Si content influence the formation of fir-tree-zones.” (p. 473,
col. 1, second para.).
5) Brusethaug reports that in a comparison of two sheet ingots
containing 0.26% Fe and 0.13% Si, cast at a speed of 90 mm/min, “fir-
tree zone was only observed in the ingot with a grain refiner addition.”
(p. 473, col. 2, first para.).
6) Brusethaug discloses that “[c]asting speed and Fe/Si ratio are
clearly dominating parameters regarding the fir-tree zone formation.”
(p. 473, col. 2, second para.).
7) Brusethaug also reports that the testing results “suggests that both
grain refiner addition and the B/Ti ratio influences the fir-tree zone
formation.” (p. 474, col. 1, second para.).
8) Sawada discloses a method for producing an Al-Fe-Si alloy
planographic printing plate. (Abstract).
9) A DC method may be used to produce an aluminum cast ingot
(col. 5, ll. 6-8) which is subsequently subjected to rolling and graining
(see, e.g., col. 3, l. 42-col. 4, l. 12).
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