Patents by Inventor Yoshifumi Nakahara

Yoshifumi Nakahara 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).

  • Water-absorbent resin and process for producing the same
    Patent number: 4771105
    Abstract: A water-absorbent resin of polyacrylic acid series characterized in that the resin has the crosslinked surface formed by reacting a powdery water-absorbent resin of polyacrylic acid series with an aluminum compound which can react with the powdery resin in the presence of polyhydric alcohol and water.
    Type: Grant
    Filed: February 4, 1987
    Date of Patent: September 13, 1988
    Assignee: Sekisui Kaseihin Kogyo Kabushiki Kaisha
    Inventors: Hideharu Shirai, Fumito Yamai, Setsuo Inada, Hisashi Ike, Yoshifumi Nakahara
  • Apparatus for producing thermoplastic resin foam
    Patent number: 4626183
    Abstract: Apparatus including an extruder, a die member and a vacuum device connected in series. The vacuum device includes a chamber and a device at at least the outlet thereof to air-tightly seal the chamber around the extruded mass of foamed thermoplastic resin. The air-shielding or sealing device is an annular tube which is inflatable radially inwardly having a flexible inner face which seals around the extruded mass. A durable, abrasion-resistant, flexible protective sheet can be interposed between the mass and the tube.
    Type: Grant
    Filed: February 28, 1984
    Date of Patent: December 2, 1986
    Assignee: Sekisui Kaseihin Kogyo Kabushiki Kaisha
    Inventors: Hideharu Shirai, Yoshifumi Nakahara