I don't know much about uBeam but I would just like to add that there are competing wireless charging startups that do have proven prototypes and real products

I don't know much about uBeam but I would just like to add that there are competing wireless charging startups that do have proven prototypes and real products on the market. One example is Chargifi. They have wireless charging mats in coffee shops. (Their charging distance is much smaller than what's shown in sketches for uBeam.)