Patents by Inventor Syoji Tokuda

Syoji Tokuda 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).

  • Electret Filter
    Patent number: 5436054
    Abstract: An electret filter formed by laminating a plurality of network electret film-split fiber fleeces having a different mesh size. It exhibits a high collecting efficiency with a very small pressure loss and without any appreciable fiber dropping, or any channeling.
    Type: Grant
    Filed: October 19, 1994
    Date of Patent: July 25, 1995
    Assignee: Toyo Boseki Kabushiki Kaisha
    Inventors: Yatsuhiro Tani, Syoji Tokuda