Isobutanol fermentation by-products can not be benign by the nature of their bio-chemistry.

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Once he does that, though, he expects to get contracts to buy his isobutanol that will run anywhere from three to 10 years.

FORBES: Name You Need To Know: Gevo

The amped-up yeast can transform cane sugar into isobutanol as well.

FORBES: Name You Need To Know: Gevo

As is typical with patents, the patent claims appear to overlap in places, with both companies saying they have patents on the technique of boosting chemical pathways in yeast that produce isobutanol.

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