Patents by Inventor Eri Nagayoshi

Eri Nagayoshi 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 the preparation of 5,6,7,8-tetrahydrofolic acid
    Patent number: 4665176
    Abstract: A process for the preparation of 5,6,7,8-tetrahydrofolic acid which comprises dissolving and/or suspending folic acid or dihydrofolic acid in an aqueous solution containing an inorganic base, and bringing the resulting solution or suspension into contact with hydrogen in the presence of a noble metal catalyst while maintaining its pH at 5-9, thereby catalytically hydrogenating the folic acid of dihydrofolic acid into 4,5,6,7-tetrahydrofolic acid.
    Type: Grant
    Filed: October 10, 1985
    Date of Patent: May 12, 1987
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Yutaka Hirai, Masaaki Torisu, Eri Nagayoshi