(credit: Larry Rosenstein)
Apple went all-out in its patent assault on Samsung beginning in 2012, when Steve Jobs’ promised “thermonuclear war” against Android became a reality.

The patents used by the Cupertino device maker weren’t just challenged in court, though.
Various parties have challenged Apple’s most important patents at the US Patent and Trademark Office, as well.
On Friday, the US Court of Appeals for the Federal Circuit issued an opinion (PDF) about an “ex parte reexam,” filed against Apple’s patent by an anonymous party.

The reexam claimed that one of the patents upholding Apple’s big win against Samsung, US Patent No. 7,844,915, never should have been issued at all.

The ‘915 patent was described in a general way as the “pinch to zoom” patent, but its claims describe a way of distinguishing between one-touch and two-touch operations.
In 2013, the US Patent and Trademark Office’s reexamination unit rejected all claims of Apple’s ‘915 patent.

A patent appeal board upheld the cancelation, leaving Apple to turn to the Federal Circuit, which has ultimate jurisdiction. On Friday, a panel of Federal Circuit judges sided with the patent office on some of the claims, but revived three others.
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