Patents by Inventor Karlene E. Hall

Karlene E. Hall has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for producing 2,5-diketogluconic
    Patent number: 4263402
    Abstract: A process for producing 2,5-diketogluconic acid which comprises aerobically propagating Acetobacter cerinus in a D-glucose-containing fermentation medium.
    Type: Grant
    Filed: September 28, 1979
    Date of Patent: April 21, 1981
    Assignee: Pfizer Inc.
    Inventors: Donald A. Kita, Karlene E. Hall
  • Preparation of 2-keto-L-gulonic acid
    Patent number: 4245049
    Abstract: 2-Keto-L-gulonic acid, an ascorbic acid intermediate, is prepared by cultivating a microorganism of the genus Citrobacter in an aqueous nutrient medium in the presence of 2,5-diketo-D-gluconic acid.
    Type: Grant
    Filed: January 21, 1980
    Date of Patent: January 13, 1981
    Assignee: Pfizer Inc.
    Inventors: Donald A. Kita, Karlene E. Hall