Faulding Inc said on Tuesday Purdue Frederick Co filed a patent infringement lawsuit against Faulding and its Purepac Pharamceutical unit .
<response> <organization>Faulding Inc</organization> said on Tuesday <organization>Purdue Frederick Co</organization> filed a patent infringement lawsuit against <organization>Faulding</organization> and its <organization>Purepac Pharamceutical</organization> unit . </response>