Patents by Inventor Kristen Janet Stead

Kristen Janet Stead 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).

  • Mutant carotenoid ketolase
    Patent number: 7422873
    Abstract: CrtW carotenoid ketolases are provided useful for the production of astaxanthin. The ketolases genes of the present invention exhibit improved ketolase activity when converting cyclic hydroxylated carotenoid intermediates into astaxanthin. Recombinant expression of the present carotenoid ketolases in host cell producing cyclic hydroxylated carotenoid intermediates enabled increased production of astaxanthin.
    Type: Grant
    Filed: March 31, 2006
    Date of Patent: September 9, 2008
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Kristen Janet Stead, Henry Yao, Rick W. Ye