What if we came up with a way to directly connect the device to the ubeam device? Like some kind of connecting wire through which the energy could travel? THEN we'd have some serious efficiency!

Concentrated beam I imagine. I wonder about heat generation locally.

It's a laptop charger ... and a crowd control device!

It's more likely that a somehow extremely directional soundwave would knock a phone off the table than provide any appreciable amount of power.

The ability to create a directional soundwave powerful enough to move specific objects from across the room would be a highly useful invention of its own, quite aside from remote power charging.