In Aspex Eyewear Inc. v. Clariti Eyewear, Inc., No. 2009-1147 (Fed. Cir. 5/24/2010), Aspex sent Clariti several letters in 2003 alleging infringement of Aspex patents pertaining to eyewear. The last letter from Clariti was sent in June, 2003. Aspex then had no further contact with Clariti until August, 2006, when Aspex again renewed its allegations …

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