If you comb over the latest filings you will find that there is not much information about a current prototype of a PRO however it was stated that an Auto Cad machine had been purchased for the technical drawing for such.
from a website I can not post a link to
The above quoted test was on a International Engine that I think is now owned by Navistar.....do some research on Navistar and you will find they are having terrible problems with things that the PRO should be able to solve.
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I think you will see the 18 wheeler industry moving to Nat Gas over the next 5 years and the PRO will need to be used on other type diesel engines.
I do not expect revenues from the PRO anytime in the near furture.