Square’s Power Efficient Card Reader
Square is a digital payment company known for its card reader that attaches to a mobile device (e.g., a smart phone). Square appears to be one of the ‘winners’ of this pandemic, having its stock practically triple in the last year.
Founder Jack Dorsey has many patents to his name relating to their mobile payment system. One of which is US9,858 ,603B2 which relates to a way of preventing the smart phone from perceiving that the card reader has been disconnected during power cycles.