I have had many granted patents in my time, so I know a little about these things.
From above USP reference:
"[0010] It is therefore one aspect of the present invention to provide a foamed glass article for us as a thermal energy control medium.
[0011] It is another aspect of the present invention to provide a foamed glass article for use as a thermal energy control medium in heating and/or cooling a building."
It certainly seems feasible to trap 'heat' in glass bubbles and it would be nice to have free heat supplied to a building - free after you have paid for the glass bubbles, of course.
Alternatively to take 'heat' from hot places and exhaust it to the surroundings in a controlled way.
My only question would be the potential difference driving force (temperature) to work effectively.
However, I would raise the point as to why post this thread?
Cat