SoftBank Group Corp. is in talks to invest from $500 million to $750 million in Zume Inc., a startup that makes and delivers fresh pizzas with the help of robots, according to people familiar with the conversations.

Zume owns a patent for delivery trucks capable of cooking food while en route to customers. The startup's proprietary trucks are loaded in part by robots, and have ovens that fire up on demand via a remote cloud signal. The technology allows Zume to operate legally despite some laws preventing food truck companies from preparing food while a delivery vehicle is in motion.

In addition to delivering pizza, Zume creates technology to manage perishable supply chain logistics and sees an opportunity to partner with companies that wish to provide freshly cooked menu items to customers.