PCTEL Inc. a provider of Internet access technology, 802.11 mobility software, and software-defined radio products, announced May 27 that it has filed patent infringement lawsuits against modem manufacturers Agere Systems Inc., Broadcom Corporation, and U.S. Robotics Corporation.

The complaints were filed on May 23, 2003 in the Northern District of California, asserting that these companies have infringed modem technology developed or acquired by PCTEL. PCTEL previously filed a complaint against 3COM Corporation for infringing PCTEL modem technology. That complaint was filed in March 2003.