Patents by Inventor Katsuyasu Nagahama

Katsuyasu Nagahama 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 preparing hexamethylene bis-dicyandiamide
    Patent number: 4250109
    Abstract: Hexamethylene.bis-dicyandiamide is safely prepared in good yield and desired purity by a novel method which comprises reacting N-cyano-O (or S)-alkyl-iso (or isothio) urea with hexamethylenediamine. The desired product is useful as an intermediate of chlorhexidine which is an antibacterial agent.
    Type: Grant
    Filed: August 7, 1979
    Date of Patent: February 10, 1981
    Assignee: Sogo Pharmaceutical Company Limited
    Inventors: Saburo Uchikuga, Michiro Itoh, Katsuyasu Nagahama