Patents by Inventor Sumio Mitani

Sumio Mitani 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 for coating the photoresist onto a belt-like material comprising a perforated carrier and metallic foil
    Patent number: 4051274
    Abstract: A method for coating the photoresist by coating rollers onto a belt-like material comprising a perforated film carrier and a metallic foil laminated thereon. This belt-like material, which has so-called device holes or apertures punched off with a predetermined pitch and is particularly to be used for producing lead frames for IC devices, is wound around a back-up roller with its metallic foil facing outward to give a slight tension to the metallic foil. Thus, a uniform and continuous coating of the photoresist onto the foil may be obtained without any dents formed even at those device holes or apertures.
    Type: Grant
    Filed: March 31, 1976
    Date of Patent: September 27, 1977
    Assignee: Dainippon Screen Seizo Kabushiki-Kaisha
    Inventors: Kazuo Hata, Sumio Mitani