Patents by Inventor Yuuki Numazaki

Yuuki Numazaki 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).

  • Patent number: 5104707
    Abstract: A transfer sheet for making a printed-wiring board by injection molding which is free from circuit damage during injection molding and has excellent releasability comprises a carrier film, a copper foil circuit, and a releasing layer provided between the carrier film and the copper foil circuit. Preferably, said releasing layer has a T-type peeling strength between the carrier film and the copper foil circuit of 0.025-0.25 kg/25 mm. A method for producing such transfer sheet comprises coating a releasing layer on a carrier film, then contact-bonding a copper foil thereto with heat, pattern-printing an etching resist on the resulting laminate film, and subjecting it to etching to form a copper foil circuit.
    Type: Grant
    Filed: June 7, 1990
    Date of Patent: April 14, 1992
    Assignee: Nitto Boseki Co., Ltd.
    Inventors: Akihiko Watanabe, Yuuki Numazaki, Naoto Kanno, Hirokazu Inoguchi