Patents by Inventor Tsutomu Watabe

Tsutomu Watabe 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).

  • 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