PALO ALTO, Calif. - HPannounced it has refiled its Federal District court litigation pertaining to the sale of patent-infringing cartridges as well as the sale of products incorporating stolen components.

The refiling of the complaint identifies an additional defendant, Asia Pacific Microsystems Inc. (APM) of Taiwan, an affiliated company of Taiwan-based UMC Group. The refiled case also adds Hewlett-Packard Development Company, a subsidiary of HP, as a plaintiff in the case.

The original case is Hewlett Packard v MicroJet Technology, No. C 10-00965 EMC, U.S. District Court, Northern District of California (San Francisco). HP also is taking similar steps to introduce APM as a respondent in a parallel investigation regarding the patent claims before the U.S. International Trade Commission (ITC). The Federal District court and ITC complaints also name the following as defendants: Mipo Technology Limited of Hong Kong, Mipo Science & Technology Co. Ltd. of China, Mextec Group Inc. D/B/A Mipo America Ltd. of Florida, Sinotime Technologies Inc. D/B/A All Colors of Florida, and Ptc Holdings Limited of Hong Kong. HP will soon be taking similar steps to introduce APM as a defendant in parallel litigation on the patent claims before the ITC.

HP¡¯s allegations of infringement arise from ongoing enforcement efforts by HP.