Patents by Inventor Takafumi Hirama

Takafumi Hirama 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).

  • Dust collecting filter cloth
    Patent number: 5318831
    Abstract: A filter cloth having a needle felt layer laminated to a nonwoven fabric sheet made of ultrafine fibers. The fibers of the nonwoven fabric sheet have a fineness of 0.2 denier or less and the fabric sheet is formed by the melt blow method. The needle felt layer preferably has a weight of from 150 g/m.sup.2 to 900 g/m.sup.2, a longitudinal tensile strength of at least 20 kg/5 cm, a transverse tensile strength of at least 20 kg/5 cm and a bursting strength of at least 10 kg/cm.sup.2.
    Type: Grant
    Filed: July 27, 1990
    Date of Patent: June 7, 1994
    Assignee: Ichikawa Woolen Textile Co., Ltd.
    Inventors: Takafumi Hirama, Mitsugu Fujihira