April 12 (Reuters) - Csl Ltd CSL.AX -
* Has become aware that Shire Viropharma has filed a complaint in us district court for district of delaware
* CSL remains highly confident that csl830 does not infringe any valid claim of shire viropharma patent and will vigorously defend against claims
* Complaint alleging infringement of a newly granted us patent in connection with a method of treating hereditary angioedema Source text for Eikon: ID:nASX3ZBVHB Further company coverage: CSL.AX