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Masimo found out about restoration of pulse oximetry to the Apple Watch the same way that the rest of the world did, and is suing US Customs and Border Protection to stop the process.
Apple has briefly been able to reactivate blood oxygen detection in the United States
The back and forth between Masimo and Apple has been going on since 2020. After years of appeals, it seemed Apple would have to wait until a blood oxygen sensor patent expired in 2028, but then an announcement was made on August 14.
Apple revealed that the blood oxygen detection feature that was banned by the US International Trade Commission due to patent infringement would return imminently. According to a new federal lawsuit filed by Masimo on August 20, covered by Bloomberg Law, that press release was the first Masimo had heard of such a deal.
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