Patents Assigned to Hawegawa Chemical Industry Co., Ltd.
  • Porous FRP sheet and manufacturing method thereof
    Patent number: 4388365
    Abstract: According to the present invention, a porous FRP sheet can be easily manufactured without need for the punching or drilling process which is required in conventional prior methods for manufacturing an FRP sheet. The FRP sheet manufactured by the present method has superior reinforcing characteristics, since the reinforcing fibers composing the FRP sheet are not cut but are retained in continuous condition.
    Type: Grant
    Filed: February 22, 1982
    Date of Patent: June 14, 1983
    Assignee: Hawegawa Chemical Industry Co., Ltd.
    Inventor: Shigekazu Hasegawa