Patents by Inventor Katsuhiko Imada

Katsuhiko Imada 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 of producing polishing sheet material
    Patent number: 5094670
    Abstract: A method of producing an abrasive backing or a polishing sheet material which has a nonwoven fabric of a synthetic fiber having a network structure and impregnated with a polyurethane solution. The method has the steps of completely coagulating and drying the polyurethane solution to prepare a base material, removing a skin layer from each surface thereof, dipping the resultant base material in an aqueous solution of a solvent for a short period of time, and treating it in a high-temperature atmosphere for a short period of time.
    Type: Grant
    Filed: February 26, 1991
    Date of Patent: March 10, 1992
    Assignee: Fuji Spinning Co., Ltd.
    Inventor: Katsuhiko Imada