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The article needs a link to the reexamination certificate. This USPTO link is now gone.

 USPTO ex-parte reexamination certificate (7428th), issued on March 30, 2010

-- Goatbar ( talk) 17:11, 7 April 2011 (UTC) reply

I don't know where to find a link, but sources do not need to be available online to be valid. If you need a source showing that the patent was canceled, here is one. -- Muhandes ( talk) 18:41, 7 April 2011 (UTC) reply