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On 5 March 2008, the U.S. Patent and Trademark Office agreed to reexamine the '341 patent, finding that the new prior art raised substantial new questions regarding the patent's validity.[14] In light of the reexamination, the accused infringers in four of the five pending lawsuits have filed motions to suspend (stay) their cases until completion of the U.S. Patent and Trademark Office's review of the '341 patent. On 23 April 2008, a judge presiding over the two lawsuits in Chicago, Illinois granted the motions in those cases.[15] On 22 July 2008, the Patent Office issued the first "Office Action" of the second reexamination, finding the claim invalid based on nineteen separate grounds.[16] On 24 November 2009, a Reexamination Certificate was issued cancelling all claims.[citation needed]