Patents Assigned to Shigermatsu Works Co., Ltd.
  • Inhalation valve
    Patent number: 5829433
    Abstract: Film made of floppy and deformable synthetic resin is used as a valve body of an inhalation valve and attached to the surface of a valve seat which is formed to a concave groove like shape having an arbitarily sectional view. The said valve body can not be applied to a conventional valve seat which has a flat surface. The inhalation valve is embedded to the breathing-in space of mask in which a filter pad is put in and prevent the valve body which separates from the seat at inhalation timing from entering into face contact part.
    Type: Grant
    Filed: July 1, 1996
    Date of Patent: November 3, 1998
    Assignee: Shigermatsu Works Co., Ltd.
    Inventors: Nobuo Shigematsu, Kenichi Ono, Tsutomu Watabe