US Patent 10007890 Collaborative unmanned aerial vehicle inventory system

The disclosed inventory systems and methods can be used to retrieve and transport items from one location in an inventory system to another. Specifically, an unmanned aerial vehicle (UAV) including passive buoyancy element, a thrust unit, and a retention feature, can be controlled by a management component to retrieve one or more items, transport the item or items, and deposit the item or items. For example, a UAV can be controlled to obtain an item at one location in a warehouse such as a first floor and lift said item to a second location in the warehouse such as a second floor, and deposit the item at the second location.