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Apple expands patent infringement suit against HTC

The iPhone maker adds two patents to its original complaint against the Taiwanese handset maker.

James Martin/CNET

After accusing HTC of infringing on 20 of its iPhone patents in March, Apple has expanded its suit.

This week Apple tacked on two more patents that it claims the Taiwanese handset manufacturer is in violation of using, according to a legal filing in U.S. District Court in Delaware.

The newly added patents both concern the same type of technology, which Apple lists as a "system for real-time adaptation to changes in display configuration."

In the original suit, Apple alleged that HTC is infringing on patents related to the iPhone's graphical user interface and the iPhone's underlying hardware and software design.

The U.S. International Trade Commission is currently investigating. HTC has countersued Apple, claiming that the iPhone violates five of its patents.