Patents by Inventor Tsunehiko Inoue

Tsunehiko Inoue 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).

  • Air filter assembly
    Patent number: 4323374
    Abstract: An air filter assembly including an electret filter sheet of material which exhibits electrical charges of opposite sign on opposite faces thereof and a non-electret conventional filter sheet of material combined with and disposed upstream from the electret filter sheet of material, whereby particles of a large diameter are collected by the non-electret filter sheet of material and particles of a small diameter are collected by the electret filter sheet of material without causing clogging or air pressure loss.
    Type: Grant
    Filed: October 19, 1979
    Date of Patent: April 6, 1982
    Assignee: Nitta Belting Co., Ltd.
    Inventors: Takehisa Shinagawa, Tsunehiko Inoue