Higher frequency RF signals are fairly easy (especially V/UHF) to beamform into a tight area, which can compensate for the loss, by focusing your power in one direction instead of radially. You still lose power over distance as the beam's energy spreads.
I don't believe they will just be able to blob a "networked" 60Hz transmission into a 1cm area - I did not read the patent, but you may be able to do such a thing by varying the phase to induce a 60Hz wave via beat frequencies between transmitting signals, at ONLY the specified area.
Having the necessary +-1Hz resolution on a 2.4GHz carrier (especially one that is not using a hardware connected, phase locked oscillator) may prove very difficult if not impossible. I suspect they may try to use one of the lower scientific bands around 900 or less MHz. HF is also a fairly unregulated option, though tight beamforming may still be difficult. Perhaps a smart application of null steering could create the necessary oscillation - I am still working this out in a simulation.
If this method is correct, keeping everything tight enough to be within US electrical standards will be difficult - there are specific regulations related to in-band power, harmonics, frequency tolerances, etc. Regardless of all that, this technology is pretty incredible and I look forward to investigating it further!
