A US agency has ruled that Apple did not violate graphic patents owned by S3, a unit of Taiwan\'s HTC. S3, which makes image compression technology, filed a complaint with ITC in May 2010. The company accused Apple of infringing four patents, which it said were used widely in a range of Apple products. Apple is embroiled in numerous patent disputes in many countries, most famously with Samsung. The US International Trade Commission (ITC) said its investigation into the matter between Apple and S3 has been terminated. Shares in HTC, which purchased S3 in July, fell 4.9% on the news. More on This Story