Presumably, most of them filed patents before their demise. So Google Patents is a good place to start https://patents.google.com/?q=smart+refrigerator&oq=smar

Presumably, most of them filed patents before their demise. So Google Patents is a good place to start https://patents.google.com/?q=smart+refrigerator&oq=smart+refrigerator+ https://patents.google.com/?q=smart+refrigerator&oq=smart+re...