HTC has not yet seen the lawsuit filing, so cannot comment specifically about it, said Keith Nowak, media relations manager at the company's North American headquarters in Bellevue, Washington. The HTC lawsuit shows it is serious about doing so. When Apple first introduced the iPhone, it made a point of saying that it had hundreds of patents on it and would aggressively defend them, Howe said. Nokia has recently filed suits against Apple, charging it with infringing its patents. 'In the same way that Nokia recognized Apple as a serious competitor, Apple is recognizing HTC as a serious competitor now,' said Charles Golvin, an analyst with Forrester Research. Apple's filings show that it is defending its position.