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The US Supreme Court on Tuesday overturned a $399 million patent infringement penalty imposed on Samsung for copying Apple's iPhone design, in a case watched for its implications for technology innovation.

The shorthanded justices ruled 8-0 that Samsung should not be required to forfeit the entire profits from its smartphones for infringement on design components, sending the case back to a lower court.

While the ruling was short on specifics, analysts said it was likely to curb litigation from patent holders expecting to reap big profits from infringement on a component.

A jubilant Samsung hailed the "victory for Samsung and for all those who promote creativity, innovation and fair competition in the marketplace."

The 11-page ruling found that the $399 million penalty -- one element of a major patent infringement case -- was inappropriate because it represented "Samsung's entire profit from the sale of its infringing smartphones" for copying the iPhone's "rectangular front face with rounded edges and a grid of colorful icons on a black screen."

But the court stopped short of delving into details of how the lower court should determine the penalty.

Justice Sonia Sotomayor wrote in the opinion that "doing so would require us to set out a test for identifying the relevant article of manufacture... and to parse the record to apply that test in this case."

The court sent the case back to the appellate court in Washington to resolve the details.

The case is one element of the $548 million penalty -- knocked down from an original $1 billion jury award -- Samsung was ordered to pay for copying iPhone patents.

Observers had been watching to see how the court -- which had not taken up a design patent case in more than a century -- would tip the balance between technological innovation and protecting intellectual property.

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