text: Faulding target of patent lawsuit . ELIZABETH , N.J. 1996-08-27 Faulding Inc said on Tuesday Purdue Frederick Co filed a patent infringement lawsuit against Faulding and its Purepac Pharamceutical unit . The suit was filed because of Purepac 's manufacture of Kadian , a sustained release morphine product , Faulding said . Faulding said the claims in the lawsuit are without merit and will not impact upon the launch of Kadian in the United States . Kadian was approved for sale in the United States last month , Faulding said . Zeneca Group Plc , which will market Kadian , was named in the lawsuit with F.H. Faulding & Co , the majority shareholder of Faulding Inc , the company said .