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AK Steel Corp. v. Sollac
The CAFC concluded that, based the specification, silicon in excess of 0.5%
by weight would materially alter the basic and novel properties of the
invention, and that the claim language "coating metal consisting essentially
of aluminum" must therefore be interpreted to permit no more than 0.5%
silicon by weight in the aluminum coating.
For more patent information, see
http://www.patentcribsheet.com/Cases/aksteel.html.
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impacting patent preparation and prosecution. It does not constitute legal
advice, nor does it create or constitute any attorney-client relationship.
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