Patents by Inventor Yoshiro Otowa

Yoshiro Otowa 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).

  • Production of high quality activated carbon
    Patent number: 5064805
    Abstract: The invention relates to a method of producing activated carbon with a large surface area and a low sulfur content. Coconut shell char, as a carbonaceous material, is mixed with granular potassium hydroxide hydrate with a water content of 2 to 25 weight %, as an activator, in a weight ratio of 1:2 through 1:6 and the mixture is heat-treated at a temperature necessary for activation.
    Type: Grant
    Filed: September 29, 1989
    Date of Patent: November 12, 1991
    Assignee: Kansai Netsukagaku Kabushiki Kaisha
    Inventor: Yoshiro Otowa