Workhorse Group Granted U.S. Patent Titled ‘Package delivery by means of an automated multi-copter UAS/UAV dispatched from a conventional delivery vehicle’
https://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.htm&r=4093&f=G&l=50&d=PTXT&p=82&S1=20210810&OS=20210810&RS=20210810