Patents by Inventor Yoshimi Oshitari

Yoshimi Oshitari 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).

  • High performance gas filter assembly
    Patent number: 4877433
    Abstract: The high-performance filter assembly has a filter paper made of synthetic or glass fibers and a fine particle checking member provided on the air outlet surface of the filter paper so as to overlap each other. The fine particle checking member is a thin microporous film preferably comprised of expanded porous PTFE. The assembly also has a breathable reinforcing paper member laminated or bonded to the particle checking number, in which this entity is further bonded or laminated to the air outlet surface of the filter paper.
    Type: Grant
    Filed: September 26, 1988
    Date of Patent: October 31, 1989
    Inventor: Yoshimi Oshitari
  • Air filter medium
    Patent number: 4728349
    Abstract: An air filter medium, in which a dust-collecting layer of glass fibers of a diameter necessary for obtaining a desired dust-collecting efficiency is formed on a supporting fiber layer of low dust-collecting efficiency and low pressure drop to a sufficient thickness to obtain a desired dust-collecting efficiency and a desired pressure drop of the air filter medium.
    Type: Grant
    Filed: March 22, 1985
    Date of Patent: March 1, 1988
    Inventor: Yoshimi Oshitari