Patents by Inventor Kichiro Iwamoto

Kichiro Iwamoto 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).

  • Method of regenerating a degraded working solution for the production of hydrogen peroxide
    Patent number: 3965251
    Abstract: A working solution comprising anthraquinone and its derivatives, used for the production of hydrogen peroxide on becoming degraded by formation of non-effective anthraquinone is generated by an auto-oxidation process employing anthraquinone, which comprises:Contacting, at a temperature of below 130.degree.C., and in the presence of a catalyst comprising a metal selected from a platinum group and supported on a carrier, said degraded working solution, which comprises non-effective anthraquinone and tetrahydroanthraquinone with an olefinic compound whose hydrogenation product is gaseous at said contact temperature andSubsequently, contacting the thus treated working solution, at a temperature above 130.degree.C., and in the presence of a catalyst comprising a metal selected from the platinum group and supported on a carrier, with an olefinic compound whose hydrogenation product is gaseous at said contact temperature,Said method being characterized by the fact that at a temperature below 130.degree.C.
    Type: Grant
    Filed: August 2, 1973
    Date of Patent: June 22, 1976
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Hiroshi Shin, Junichiro Sugano, Tadashi Yoshii, Kichiro Iwamoto, Yasuhisa Kuriyama, Minoru Kakuda