This is an invention from the middle of the last century. The two patents describe a device with 4 leds, a temperature sensor, and a processor. The invention

This is an invention from the middle of the last century. The two patents describe a device with 4 leds, a temperature sensor, and a processor. The invention of the pulse ox was innovation. Putting it on a portable device and increasing the number of LEDs to 4 is not the level of contribution that really justifies 20 years of legal protection.