The Tokyo District Court rejected the South Korean technology giant's claims in September and October, saying there had been no patent infringement by the U.S. company's Japanese unit.
The patents in question involve the technology for downloading an app to add new functions to a smartphone and the so-called airplane mode, which suspends a phone's communications without turning off the power during flight.
Samsung alleged that the iPhone 4 and iPhone 4S infringed on the patents it holds in Japan related to those two areas. But in a ruling on Sept. 14, the court said that iPhone's app technology is different from Samsung's. On Oct. 11, the court ruled that the iPhone had not infringed on Samsung's other patent either, saying the airplane mode function is not a distinctly new development, but rather an extension of past innovations.
The two rivals are fighting a string of legal battles around the world.
Apple is appealing a Tokyo District Court decision handed down in August on separate patent claims against Samsung.