Apple v Masimo
US Judge Rules Against Apple In Masimo Pulse Oximeter Patent Case
Apple smartwatches could face an import ban after a U.S. judge ruled that the company infringed on one of Masimo's pulse oximeter patents.
Apple to halt some Apple Watch Sales in US
Apple is planning to stop selling some versions of the Apple Watch in the United States as soon as this week to get ahead of what could be one of the most momentous patent disputes in years.
Biden administration upholds Apple Watch ban
US president Joe Biden's administration on Tuesday opted not to veto a government tribunal's ruling to ban imports of Apple Watches.
Apple files emergency motion against Apple Watch ban
Apple filed an emergency motion with a U.S. appeals court to pause a ban on importing and selling some of its Apple Watch models.
U.S. Appeals Court temporarily stops Apple Watch Sales Ban
Apple will be able to sell the latest Apple Watches after an import ban was temporarily stopped by a U.S. appeals court on Wednesday.
Apple Resumes Watch Series 9 and Ultra 2 Sales in U.S.
Apple has started resuming sales of its Apple Watch Series 9 and Ultra 2 in the country.
Apple to Remove Blood-Oxygen Tool From Apple Watches
Apple is planning to remove its blood-oxygen feature from the Apple Watch Series 9 and Apple Watch Ultra 2, to circumvent a US ban of the devices.
Apple Watches Banned again in U.S.
From Jan. 18, Apple will again be banned from selling Apple Watch Series 9 and Ultra 2 devices in the US due to its ongoing patent infringement case with Masimo.
Apple iOS 18.6.1 restores blood oxygen monitoring in the United States
Apple has released iOS 18.6.1 for U.S. iPhones only, bringing a Blood Oxygen monitoring update.
Apple watchOS 11.6.1 restores blood oxygen monitoring in the United States
Apple has released watchOS 11.6.1 in tandem with iOS 18.6.1 bringing a Blood Oxygen monitoring update in the United States.
Masimo sues US Customs over Apple Watch Blood Oxygen feature
Masimo has filed a lawsuit against U.S. Customs and Border Protection (CBP) over the reactivation of the Apple Watch’s Blood Oxygen feature.
US Customs asks court to dismiss Masimo case
Masimo recently filed a lawsuit against U.S. Customs and Border Protection, accusing the agency of improperly allowing Apple to resume selling Apple Watches with the Blood Oxygen feature activated.
US Jury orders Apple to pay Masimo $634M in never ending patent fight
A federal jury in California has found that Apple infringed on a Masimo patent for its pulse oximetry technology and awarded Masimo $634 million in damages.
Apple Watch Blood Oxygen Workaround Doesn’t Infringe on Masimo Patents
U.S. International Trade Commission (ITC) judge has determined that Apple’s current methods of leveraging blood oxygen sensing on Apple Watch do not infringe on Masimo’s patents
U.S. International Trade Commission (ITC) judge has determined that Apple’s current methods of leveraging blood oxygen sensing on Apple Watch do not infringe on Masimo’s patents.
This follows after a long-running legal battle between the two companies.
In 2023, the ITC determined that Apple was in violation of Masimo’s patents regarding blood oxygen sensing.
This led to a potential US import ban on Apple’s Series 9 and Ultra 2 smartwatches in December 2023 before Apple earned a temporary pause in exchange for disabling the blood oxygen sensing feature in January 2024.
Following this, Apple Watch devices sold in the US that year did not offer blood oxygen sensing functionality. This remained the case until August 2025, when Apple introduced a workaround.
Using this workaround, Apple Watch is able to collect blood oxygen data but process it using the paired iPhone rather than the watch itself. The data is then only able to be viewed on the iPhone instead of being made available on Apple’s wearable.
A U.S. trade tribunal preliminarily ruled that the Apple Watch is currently not infringing on patents owned by Masimo, negating the ITC ban and is not impacted by U.S. Customs and Border Protection (CBP).
At the time of the introduction of this workaround, Masimo did not agree with Apple’s methods, once again filing a lawsuit with the CBP. The company also pressured the ITC to investigate whether Apple was violating the import ban.
Ultimately, the ITC is in favour of Apple’s new methods and believes that the company is not violating Masimo’s patents.
In late 2025, Apple lost the patent infringement lawsuit against Masimo, which awarded the company with $634 million USD (around $870 million CAD). Apple is appealing this verdict.
