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Re:Apple halts US sales of Watch before Christmas after losi... by dharmab on Monday December 18, 2023 @03:24PM (#38687682)
https://patents.google.com/patent/US10945648B2/en?oq=US-1094...

It's fairly specific about an arrangement of sensors with specific capabilities.

Re:Apple halts US sales of Watch before Christmas after losi... by fuzzbazz on Monday December 18, 2023 @03:39PM (#38687895)
If they make a version with only three photodiodes this patent will not apply.