Patents by Inventor Shigeru Kurahashi

Shigeru Kurahashi 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 apparatus
    Patent number: 3969095
    Abstract: An air filter apparatus comprising an inner sleeve having a number of small apertures, an externally tapered outer sleeve having a number of small apertures, said inner sleeve being inserted in said outer sleeve and fixed in position to form a double-wall cylinder, a funnel-shaped suction port disposed at the mouth edge of the inner sleeve on the side where the larger diameter of the outer sleeve exists and active carbon packed in a space between the inner and outer sleeves.
    Type: Grant
    Filed: August 23, 1974
    Date of Patent: July 13, 1976
    Inventor: Shigeru Kurahashi