Apple had a major setback in its ongoing patent battle with Samsung Electronics on Friday, as a federal judge slashed a $1.05 billion jury award by more than 40 percent and set a new trial to determine damages.
Apple won the award last year against Samsung in what was the biggest and highest profile trial among a number of legal challenges around the world over mobile patents.
The ruling by Judge Lucy Koh of the U.S. District Court Northern District of California in San Jose means the two mobile electronics companies may once again square off in a California court to decide how much of the $450.5 million stricken from the damages associated with 14 Samsung products should stand.
Koh said the jury had incorrectly calculated part of the damages and that a new trial was needed to determine the actual, final dollar amount, which could be less than or more than the original $450.5 million set by the jury.
The iPhone maker convinced the jury that the Korean company, which in 2012 knocked Apple off its perch atop the global smartphone market, had infringed on its iPhone and iPad patents.
On Friday Koh, rejecting Apple's motion for an increase in the jury's damages award, ordered a new trial on damages for the 14 devices, which include the Galaxy SII. The jury's award to Apple for 14 other separate products, totaling almost $599 million, was maintained.
"The court has identified an impermissible legal theory on which the jury based its award and cannot reasonably calculate the amount of excess while effectuating the intent of the jury," Koh said in her ruling.
Apple and Samsung account for 1 in 2 mobile phones sold. They also rely on each other for components and business.
Their legal tussle has been viewed as a proxy war between Apple and Google as Samsung's flagship Galaxy smartphones and tablets run on Google's Android operating system.
Shares in Apple closed down 2.5 percent at $430.47.