Patents by Inventor Hiroyuki Iesaka

Hiroyuki Iesaka 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 preparation of copolymer
    Patent number: 5200332
    Abstract: Disclosed is a process for the preparation of a copolymer, which comprises propagating cells of a bacterium having a capacity of producing poly-3-hydroxybutyrate mainly at a former stage, synthesizing and accumulating in the cells a copolymer comprising D-3-hydroxybutyrate and D-3-hydroxyvalerate by contacting the bacterium with a mixture of a carbon source utilizable by the bacterium and a primary alcohol having 3 to 7 carbon atoms, or with a primary alcohol having 3 to 7 carbon atoms, at a latter stage, and recovering the copolymer from the cells. According to this process, a copolymer comprising D-3-hydroxybutyrate and D-3-hydroxyvalerate can be manufactured in a large quantity at a low cost.
    Type: Grant
    Filed: September 13, 1991
    Date of Patent: April 6, 1993
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Tsuneo Yamane, Shunsaku Ueda, Shigeki Imagawa, Torakazu Tahara, Yoshiharu Tokunaga, Hiroyuki Iesaka, Teizi Urakami