A US judge last week denied Apple Inc’s request for a permanent injunction against Samsung Electronics’ smartphones, depriving the iPhone maker of key leverage in the mobile patent wars.

Apple had been awarded $1.05 billion in damages in August after a US jury found Samsung had copied critical features of the iPhone and iPad. The Samsung products run on the Android operating system, developed by Google.

Apple and Samsung are going toe-to-toe in a patents dispute that mirrors the struggle for industry supremacy between the two companies. For most of the year, Apple had been successful in its US litigation campaign against Samsung. Apple convinced US District Judge Lucy Koh in San Jose, California, to impose two pre-trial sales bans against Samsung – one against the Galaxy Tab 10.1, and the other against the Galaxy Nexus phone.

Apple then sought to keep up the pressure after its sweeping jury win. It asked Koh to impose a permanent sales ban against 26 mostly older Samsung phones, though any injunction could potentially have been extended to Samsung’s newer Galaxy products.

Yet the jury exonerated Samsung on the patent used to ban Galaxy Tab 10.1 sales, and Koh rescinded that injunction. Then, in October, a federal appeals court reversed Koh’s ban against the Nexus phone.

Koh cited that appellate ruling as binding legal precedent, ruling that Apple had not presented enough evidence that its patented features drove consumer demand for the entire iPhone.

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