Patents by Inventor Naomi Muramatsu

Naomi Muramatsu 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).

  • Filter apparatus having a casing with improved structure for holding filter media
    Patent number: 5538633
    Abstract: A filter apparatus includes a box-shaped casing formed by connecting peripheral edges of first and second casing members each having a concavity and a filter composed of first and second filter media placed one upon the other and having respective peripheries held between substantially the entire peripheral edges of the first and second casing members such that the filter assumes the shape of a bag when disposed in the casing. The casing has a suction port and an exhaust port each communicating between the interior and the exterior of the casing. The filter communicates with the exterior of the apparatus through the suction or exhaust port of the casing. The first and second filter media have respective through holes and are closely adhered together at peripheral portions of the respective through holes.
    Type: Grant
    Filed: December 23, 1994
    Date of Patent: July 23, 1996
    Assignees: Toyo Roki Seizo Kabushikikaisha, Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Kyoji Kitajima, Shunichi Nogami, Hiroaki Yamashita, Keiichi Katagiri, Naomi Muramatsu