27.

Machine-readable delivery platform for automated package delivery

Shucker, Brian Daniel, and Brandon Kyle Trew. "Machine-readable delivery platform for automated package delivery." U.S. Patent No. 9,864,967. 9 Jan. 2018. https://patents.google.com/patent/US20150175276A1/en

Summary

When a customer orders something from a package delivery system a machine-readable code is generated. This generated code is then sent to the customer and the customer has to display this at the delivery location. Then the aerial delivery drone gets information about the location of delivery. When the drone arrives at the location of delivery it checks if the machine-readable code on the display is correct and drops the package there.