Masimo Moves to Fortify Apple Watch Secrets Case After Mistrial

“Manifest errors” led to the trimming of a Masimo Corp. trade secrets claim against Apple Inc. during trial before other claims reached a jury—and eventual mistrial—Masimo told a California federal court.

The motion comes after a jury couldn’t decide whether Apple stole the medical device company’s trade secrets to craft the Apple Watch’s blood-oxygen sensor. Apple convinced a judge during trial that some of Masimo’s claimed trade secrets were “generally known,” cutting them from the case before it went to the US District Court for the Central District of California jury.

As it pertained to one of the secrets, that ...