Patents by Inventor Katsuzo Kubota

Katsuzo Kubota 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 modification of coal
    Patent number: 4645513
    Abstract: A process for upgrading the characteristics of moisture containing coal which comprises drying coal until the water content reaches substantially zero, rapidly heating the dried coal to a molding temperature of from 200.degree. to 400.degree. C. within a time of from 1 to 10 minutes, compression molding the dried coal under elevated pressure, oxidizing the molded coal and then steaming said oxidized molded coal in saturated moisture at from 80.degree. C. to 150.degree. C. from 2 to 8 hours to provide a dry upgraded coal having a decreased tendency to self-ignite.
    Type: Grant
    Filed: June 21, 1985
    Date of Patent: February 24, 1987
    Assignee: Idemitsu Kosan Company Limited
    Inventors: Katsuzo Kubota, Masayuki Nakai, Shigeyoshi Ono