Core Points - Masimo has filed a lawsuit against the U.S. Customs and Border Protection (CBP), alleging that CBP unlawfully allowed Apple to reinstate a blood oxygen monitoring feature on the Apple Watch that infringes on Masimo's patents [1] - The dispute stems from a 2023 ruling by the U.S. International Trade Commission, which found Apple guilty of patent infringement, leading to a suspension of certain Apple Watch sales [1] - On August 14, Apple announced a software update to restore the blood oxygen monitoring feature by shifting the calculation process to the paired iPhone instead of the watch itself [1] - Masimo claims it was unaware of CBP's unilateral decision made two weeks prior, which overturned an earlier ruling without consulting Masimo, violating standard procedures [1] - The lawsuit cites violations of the Administrative Procedure Act and the due process clause of the Fifth Amendment [1] Legal Actions - Masimo is seeking a temporary restraining order and a preliminary injunction to prevent the enforcement of CBP's August 1 ruling [2] - The company aims to restore the January decision, which was made with participation from both Apple and Masimo, stipulating that related products could only be imported if the blood oxygen monitoring feature was disabled [2]