If you have figured out how to recover 100% of the potential energy of a falling body with "specially designed mechanical means" to the extent that you are able to raise that same body to its original height, then I heartily congratulate you.Due to gravity,the ball does falls and releases energy back,which was required to lift up(which can be recovered by specially designed mechanical means.)
I have to admit, that even though I have read your last post several times, I am still in the dark as to what "the impulsive potential energy of gravity" is. This is no doubt due to my limited ability to grasp complex concepts and nothing to do with your wondrous discovery. I will therefore bow out of this thread with the troubling realization that I do not possess the necessary mental alacrity.
The link below may be of some little help to you:
From: http://en.wikipedia.org/wiki/Elastic_collision
An elastic collision is an encounter between two bodies in which the total kinetic energy of the two bodies after the encounter is equal to their total kinetic energy before the encounter. Elastic collisions occur only if there is no net conversion of kinetic energy into other forms.