Espoo, Finland - Nokia stepped up its involvement in the wireless industry's patent-infringement wars by filing claims in the United States and Germany against HTC, RIM and Viewsonic.
Nokia alleges the companies infringe on a combined total of 45 patents.
In 2009, the company filed complaints against Apple before the ITC and a federal court. That suit has been settled.
In its latest salvo, Nokia filed a complaint against HTC before the U.S. International Trade Commission (ITC), lawsuits against HTC and Viewsonic in a U.S. federal district court, suits against HTC and RIM in a German court, and suits against all three companies in other German courts.
The patents include technologies used in dual-function antennas, power management, and multimode radios. Other patents cover enhanced software features for application stores, multitasking, navigation, conversational message display, dynamic menus, data encryption and retrieval of email attachments on a mobile device.