Gevo: PTO is reviewing patent issued to Butamax

11/28/2011 | Bloomberg

The U.S. Patent and Trademark Office is re-evaluating a patent issued in August to Butamax Advanced Biofuels for a fuel additive, said Gevo, which has challenged the patent's validity. "[S]ubstantial questions exist regarding whether others invented this technology first and that several scientific journal publications had described the technology before Butamax applied for the patent," Gevo said in a statement.

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