The US Supreme Court has refused to hear a Microsoft appeal related to its ongoing web browsing patent dispute with the University of California and Eolas Technologies.
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Microsoft has already lost an appeal over a $520.6m (£306m) judgement covering an Eolas patent infringement, which concerns the technology Microsoft uses in Internet Explorer.
The Supreme Court decided not to hear Microsoft's appeal over how damages in the case should be calculated.
Microsoft had been asking the court to reject a previous ruling that damages should be awarded based on Microsoft's US and foreign sales, claiming that the Eolas patent should only apply to US products. Eolas is a company that was spun out of the University of California.
The Supreme Court did not cite reasons for refusing to hear Microsoft’s claims.
Even though Microsoft has lost the fight over damages, it is still fighting the original ruling, as it has won the right to challenge the validity of the patent in another court.
The US Patent and Trademark Office has already ruled that the patent is valid.