Patents by Inventor Hiromi Ichioka

Hiromi Ichioka 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).

  • Injection compression molding method for optically molded products
    Patent number: 6705725
    Abstract: A method of producing an optically molded product of a thermoplastic resin by injection compression molding, the method comprising the steps of: (1) expanding the volume of a cavity more than the volume of the optically molded product of interest; (2) injecting a molten thermoplastic resin into the cavity through an injection cylinder; (3) compressing the expanded cavity to a prescribed thickness of the molded product; (4) returning an excess of the thermoplastic resin produced by the compression into the injection cylinder; and (5) keeping the molten thermoplastic resin in the cavity until the molded product of interest is formed. The present invention makes it possible to produce an optically molded product (for example, a spectacle lens) free from a weld line and excellent in surface accuracy using a metal mold having a simple structure industrially advantageously.
    Type: Grant
    Filed: May 20, 2003
    Date of Patent: March 16, 2004
    Assignee: Teijin Chemicals, Ltd.
    Inventors: Kiyohito Gotoh, Hiromi Ichioka
  • Injection compression molding method for optically molded products
    Publication number: 20030201555
    Abstract: A method of producing an optically molded product of a thermoplastic resin by injection compression molding, the method comprising the steps of:
    Type: Application
    Filed: May 20, 2003
    Publication date: October 30, 2003
    Inventors: Kiyohito Gotoh, Hiromi Ichioka
  • Injection compression molding method for optically formed product
    Patent number: 6616868
    Abstract: A method of producing an optically molded product of a thermoplastic resin by injection compression molding, the method comprising the steps of: (1) expanding the volume of a cavity more than the volume of the optically molded product of interest; (2) injecting a molten thermoplastic resin into the cavity through an injection cylinder; (3) compressing the expanded cavity to a prescribed thickness of the molded product; (4) returning an excess of the thermoplastic resin produced by the compression into the injection cylinder; and (5) keeping the molten thermoplastic resin in the cavity until the molded product of interest is formed. The present invention makes it possible to produce an optically molded product (for example, a spectacle lens) free from a weld line and excellent in surface accuracy using a metal mold having a simple structure industrially advantageously.
    Type: Grant
    Filed: October 19, 2000
    Date of Patent: September 9, 2003
    Assignee: Teijin Chemicals, Ltd.
    Inventors: Kiyohito Gotoh, Hiromi Ichioka