SAN FRANCISCO – The epic $1 billion patent fight between the world's top two smartphone makers resumes Thursday in a federal courtroom when Apple Inc. and Samsung Electronics Corp. again square off over rights to vital technology.

Samsung seeks to overturn an Aug. 24 jury verdict that found the Korean tech titan ripped off Apple Inc.'s designs for its iPhone and iPad. The jury ordered Samsung to pay Apple $1 billion after finding close to two dozen of its products used technology controlled by Apple.

Apple in turn is looking to add $500 million more to the award while barring many of the older Samsung products at issue from sale in the United States.