The U.S. Patent and Trademark Office has invalidated Apple's "bounce back" patent, which has been a valuable weapon in the company's patent suit against archrival Samsung Electronics.
The USPTO found that 17 out of 20 categories related to the bounce-back technology do not belong solely to Apple.
The technology causes an image on a screen to bounce or snap back when users scroll to the end of a list of data.
The USPTO provisionally invalidated the patent last October, but Apple appealed. A review of the case upheld the original decision.