SAN FRANCISCO -- A judge invalidated some $450 million of a $1 billion award to be paid by Samsung (IW 1000/9) in a landmark patent lawsuit from Apple, saying the calculation came from an "impermissible legal theory."

U.S. District Judge Lucy Koh affirmed the remainder of the award, amounting to $598.9 million, in the patent infringement case, while denying Apple's request for an increase in damages.

The decision marked the latest twist in the blockbuster trial pitting the maker of the iPhone against the surging South Korean electronics giant.

Apple (IW 500/9) had accused its rival of massive and willful copying of its designs and technology for smartphones and tablets.

But Koh said the jury erred in calculating damages for some of the devices in question, including some models of the Galaxy SII smartphone and Galaxy Tab tablet, and struck down as invalid the $450 million awarded to the Silicon Valley giant.

She ruled that a new trial would be needed to award damages for these items, saying that due to the "impermissible legal theory on which the jury based its award," she "cannot reasonably calculate the amount of excess while effectuating the intent of the jury."

But she encouraged both parties to have the case reviewed by an appellate court before any new trial.