Patents by Inventor Tatsuji Maruyama

Tatsuji Maruyama 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).

  • Electric double layer capacitor, activated carbon for electrode therefor and method for producing the same
    Patent number: 7564676
    Abstract: A method for producing activated carbon for electrodes of electric double layer capacitors is disclosed which comprises an activation step wherein activated carbon is obtained by mixing an alkali metal hydroxide with a carbon raw material for the activated carbon and heating the mixture in an inert gas atmosphere, a deactivation removal step wherein the alkali metal in the activated carbon is deactivated and removed, and a heat treatment step wherein the activated carbon having gone through the deactivation removal step is heated in an inert gas atmosphere at a temperature higher than 400° C. but not higher than the heating temperature in the activation step.
    Type: Grant
    Filed: October 18, 2004
    Date of Patent: July 21, 2009
    Assignee: Nippon Oil Corporation
    Inventors: Eiji Kitajima, Yuichi Nakano, Kiwamu Takeshita, Keizo Ikai, Tatsuji Maruyama, Hideki Ono, Haruyoshi Mizuta
  • Electric double layer capacitor, activated carbon for electrode therefor and method for producing the same
    Publication number: 20070041147
    Abstract: A method for producing activated carbon for electrodes of electric double layer capacitors is disclosed which comprises an activation step wherein activated carbon is obtained by mixing an alkali metal hydroxide with a carbon raw material for the activated carbon and heating the mixture in an inert gas atmosphere, a deactivation removal step wherein the alkali metal in the activated carbon is deactivated and removed, and a heat treatment step wherein the activated carbon having gone through the deactivation removal step is heated in an inert gas atmosphere at a temperature higher than 400° C. but not higher than the heating temperature in the activation step.
    Type: Application
    Filed: October 18, 2004
    Publication date: February 22, 2007
    Inventors: Eiji Kitajima, Yuichi Nakano, Kiwamu Takeshita, Keizo Ikai, Tatsuji Maruyama, Hideki Ono, Haruyoshi Mizuta