Patents by Inventor Henry Yao

Henry Yao 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
    Publication number: 20070231854
    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: Application
    Filed: March 31, 2006
    Publication date: October 4, 2007
    Inventors: Kristen Stead, Henry Yao, Rick Ye
  • Carotenoid ketolases
    Patent number: 7252985
    Abstract: Novel CrtW carotenoid ketolase are provided that are useful for the production of ketocarotenoids. The ketolases genes of the present invention exhibit low homology in comparison to other CrtW ketolases previously reported. Expression of the carotenoid ketolases in heterologous hosts enabled production of canthaxanthin and astaxanthin. Coexpression experiments using divergent crtW genes resulted in increased production of the desired ketocarotenoids.
    Type: Grant
    Filed: December 17, 2004
    Date of Patent: August 7, 2007
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Qiong Cheng, Luan Tao, Henry Yao
  • Novel carotenoid ketolases
    Publication number: 20050227311
    Abstract: Novel CrtW carotenoid ketolase are provided that are useful for the production of ketocarotenoids. The ketolases genes of the present invention exhibit low homology in comparison to other CrtW ketolases previously reported. Expression of the carotenoid ketolases in heterologous hosts enabled production of canthaxanthin and astaxanthin. Coexpression experiments using divergent crtW genes resulted in increased production of the desired ketocarotenoids.
    Type: Application
    Filed: December 17, 2004
    Publication date: October 13, 2005
    Inventors: Qiong Cheng, Luan Tao, Henry Yao