Patents by Inventor Yoshinari Koyama

Yoshinari Koyama 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 washing powdery and/or granular resins and a washing device therefor
    Patent number: 5143554
    Abstract: A process for washing a powdery and/or granular resin involves bringing the powdery and/or granular resin into contact with a washing liquid in a counterflow fashion in a tubular body with a plurality of static mixing elements disposed continuously in series, thereby removing impurities adhering to the powdery and/or granular resin and producing the powdery and/or granular resin with a less content of impurities. A washing device for use with the washing process contains a tubular body in which the static mixing elements are disposed continuously in series, and this construction is simpler than conventional ones and does not require a stirring power and mechanism to remove the impurities from the powdery and/or granular resin.
    Type: Grant
    Filed: August 23, 1990
    Date of Patent: September 1, 1992
    Assignee: Idemitsu Petrochemical Company Limited
    Inventors: Yoshinari Koyama, Daigo Shirota