Apple Inc. has to stop selling its Series 9 and Ultra 2 smartwatches with a blood oxygen feature in the US, suffering another legal setback in its patent dispute with Masimo Corp.The US Court of Appeals for the Federal Circuit declined Wednesday to grant Apple a longer pause on an import ban of the devices imposed by the US International Trade Commission. The ruling means the company has to stop selling the watches with the oxygen measurement feature while an appeal of the ban plays out — a peri...