Process for preparation of propionic acid
Patent 4732855 Issued on March 22, 1988. Estimated Expiration Date: 
March 22, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 22, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesUse of co-cultures in the production of ethanol by the fermentation of biomass Patent #: 4400470 InventorsAssigneeApplicationNo. 06/596263 filed on 04/03/1984US Classes:435/141, Propionic or butyric acid435/244, Chemical stimulation of growth or activity by addition of chemical compound which is not an essential growth factor; stimulation of growth by removal of a chemical compound435/801, ANEROBIC CULTIVATION435/822Using bacteria or actinomycetalesExaminersPrimary: Weimar, Elizabeth C.Attorney, Agent or FirmInternational ClassesC12P 7/52 (20060101)C12P 7/40 (20060101) AbstractAn improved process for the production of propionic acid comprises cultivating a propionic acid-producing bacterium anaerobically in a medium which contains a simple carbohydrate, which can be converted by the bacterium to pyruvate, as well as essential minerals, vitamins, and growth factors under an overpressure of hydrogen which is effective to cause a hydrogenase produced by the bacterium to suppress the oxidation of pyruvate to acetate and carbon dioxide and to promote the formation of propionic acid.Other References
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