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In a significant victory, Apple has successfully challenged patents at the center of a high-profile dispute with medical device company AliveCor.

The U.S. Patent and Trademark Office’s Patent Trial and Appeal Board, or PTAB, on Tuesday ruled that three AliveCor patents covering heart monitoring technologies for wearable devices were unpatentable. AliveCor alleged in federal court and before the International Trade Commission that Apple had copied the technologies with its Apple Watch, and over the summer an ITC judge found that Apple had infringed on two of three patents AliveCor asserted in its complaint.

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