text: has anyone patented an organic roof material that reproduces itself always "growing" a new protective skin? 15 years ago, i went through a week's period where i came up with over 1,000 ideas just like this, and i was not on drugs!  this particular concept would involve developing a material that simulates tree bark by using nanotechnology to build new "cells" which would be formed by using microscopic chips from the special material's underside extracted by the micromachines, carried to the upper surface where they react with sun and rainwater to form a new "skin" that bonds to the roof.  the cycle continues until the machines die.  but then can be rejuvenated with a special maintenance coating with fresh machines to continue the work.  basically, you have a simulated organic roof (real organic material could also be used) that never needs replacing in the lifetime of a house or commercial building. don't think you can patent it, but its called grass its organic only needs trimming now and again and grows year in year out.