Patents by Inventor Hirosi Isizuka

Hirosi Isizuka 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).

  • Filter medium, process for preparation thereof, filtering method and filtering apparatus
    Patent number: 4177141
    Abstract: A filter medium comprising a body of the filter medium having the space thereof partitioned three-dimensionally, irregularly and manifoldly by bent linear members having a strength sufficient to cause substantially no substantial deformation when the filter medium is actually used, and an effluent pipe connected to the body of the filter medium, said effluent pipe having an opening located in the interior of the body, from which a filtrate flows out, is disclosed. When at least one component is filtered or separated from a material to be treated by filtrate the dispersion medium as the filtrate is interposed between a filter cake and the surface portion of the body of the filter medium and the dispersion medium as the filtrate is allowed to pass very easily through the filter cake. Accordingly, clogging is not caused in the filter medium and the filtration can be performed at a substantially uniform flow rate throughout the operation.
    Type: Grant
    Filed: March 30, 1978
    Date of Patent: December 4, 1979
    Inventors: Akio Nakamura, Hirosi Isizuka