Does the Oura patent need a cuff for calibration?

The patent describes no cuff calibration. It compares each new reading with the wearer’s own baseline over time.

Is a ring the only device the patent covers?

No. A ring is the main example, but watches, necklaces and chest-worn devices are also named.

Apple's newly granted patent scores the same health reading from a watch, earbuds and other devices…

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