HTC filed the latest lawsuit Monday in U.S. District Court in Wilmington, Del., where Apple Inc. had sued HTC a year ago.

Both companies also have brought complaints before the U.S. International Trade Commission, which has the power to block imports of devices and parts found to infringe on a company's intellectual property.

In the latest case, HTC sought unspecified damages and a ban that would prevent Apple from using the technologies in question.

HTC said affected products include the iPhone, the iPad tablet computer, Mac notebook and desktop computers and iPod music players. HTC's patents cover such things as integrating a device's computing and communications functions - something basic to all smartphones.