Patents by Inventor Joaquin P. Armas

Joaquin P. Armas 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).

  • Patent number: 3975273
    Abstract: A two-stage fluid filter such as an automotive oil filter. The two-stages of filtering media are mounted inside a conventional cylindrical housing forming fluid inlet and outlet ports in one end thereof. One stage of the filtering media comprises an annular depth type filtering medium having a radially outer surface in fluid communication with the inlet port, and a radially inner surface in fluid communication with the outlet port so that fluid can flow from the inlet port to the outlet port by flowing radially through the depth type medium. The second stage of the filtering media comprises a spirally wound surface type filtering medium, such as filter paper, with alternate pairs of opposed surfaces of the spiral winding bonded to each other along the circumferential edges at one longitudinal end of the spiral winding.
    Type: Grant
    Filed: August 29, 1974
    Date of Patent: August 17, 1976
    Assignee: Parma Industries, Inc.
    Inventors: Gregory P. Shaltz, Joaquin P. Armas