Medical monitoring technology company Masimo sued U.S. Customs and Border Protection on Wednesday over a decision by the agency that allowed Apple to import Apple Watches with blood-oxygen reading technology during a patent dispute between the companies.

Masimo said in the lawsuit in Washington, D.C., federal court that Customs improperly determined that Apple can import watches with pulse oximetry technology, reversing its own decision from last year without notifying Masimo.

Masimo told the court that it learned of the agency's August 1 decision only after Apple announced it would reintroduce blood-oxygen reading to its watches last week.

Spokespeople for Apple and Customs did not immediately respond to requests for comment. A Masimo spokesperson declined to commen

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