Acer Inc, Taiwan's leading personal computer vendor, said Friday it has filed a counterclaim of patent infringement against Hewlett-Packard Development Co (HP) before the Eastern District of Texas Court in the United States. The latest counterclaim is part of Acer's response to HP's patent infringement suit against the company filed at the same court earlier this year, Acer said in a statement.

Acer claimed that HP has infringed its patents on dual-frequency antenna and DVD-ROM head technologies.