Patents by Inventor Kozaburo Nakao

Kozaburo Nakao 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 and apparatus for regenerating used active carbon
    Patent number: 4261857
    Abstract: Particles of active carbon which have been used to purify contaminated liquid are regenerated by charging the particles between spaced electrodes in a furnace and passing electric current between the electrodes to thereby heat and regenerate the active carbon by the heat generated by the specific resistance of the particles and the contact resistance therebetween.
    Type: Grant
    Filed: September 11, 1978
    Date of Patent: April 14, 1981
    Assignee: Kyoritsu Yuki Kogyo Kenkyusho
    Inventor: Kozaburo Nakao
  • Method and apparatus for regenerating used activated carbon
    Patent number: 4192962
    Abstract: In a vertical electric furnace having vertically spaced annular electrodes for regenerating used activated carbon by passing electric current therethrough, the inner cross-sectional area of the furnace is gradually decreased and then gradually increased between the electrodes thus forming a throat. With this construction, layers of the used activated carbon in which the resistance value varies with the temperature gradient are formed.
    Type: Grant
    Filed: May 19, 1978
    Date of Patent: March 11, 1980
    Assignee: Kabushiki Kaisha Kyoritsu Yuki Kogyo Kenkyusho
    Inventors: Kozaburo Nakao, Toru Miyajima