Apple Keeps Win Knocking Out Masimo Blood-Oxygen Sensor Patents

The Federal Circuit sided with Apple Inc. by affirming a series of tribunal decisions that mostly invalidated a set of Masimo Corp. blood-oxygen sensor patents that Masimo says the tech giant infringed through sales of smart watches.

A three-judge panel of the US Court of Appeals for the Federal Circuit concluded that the Patent Trial and Appeal Board had sufficient factual support for its finding that the bulk of the patent claims are obvious in light of prior art.

The decision closes one phase in a yearslong, sprawling legal battle between Apple and Masimo—competitors in the fast-growing wearable medical device ...