November 9 does in fact appear to be the expiration date, that is, 20 years after the first filing date [1, 2]. The patent owner can still sue for damages for

November 9 does in fact appear to be the expiration date, that is, 20 years after the first filing date [1, 2]. The patent owner can still sue for damages for pre-expiration infringement, going back six years (which is the statute of limitations). But damages for infringement won't continue to accrue after expiration. In addition, any injunction against infringement would expire automatically with the patent. [1] http://patft.uspto.gov/netacgi/nph-Parser?Sect2=PTO1&Sect2=HITOFF&p=1&u=/netahtml/PTO/search-bool.html&r=1&f=G&l=50&d=PALL&RefSrch=yes&Query=PN/5345551 http://patft.uspto.gov/netacgi/nph-Parser?Sect2=PTO1&Sec... [2] http://en.wikipedia.org/wiki/Term_of_patent_in_the_United_States http://en.wikipedia.org/wiki/Term_of_patent_in_the_United_St...