Patents by Inventor Jiro Kawamoto

Jiro Kawamoto 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).

  • Process for making a microporous membrane from a blend containing a poly (phenylene sulfide) polymer, an amorphous polymer, and optionally a solvent
    Patent number: 5888434
    Abstract: The invention relates to a process for preparing a microporous membrane from an unsulfonated poly(phenylene sulfide) polymer by forming a mixture of an unsulfonated poly(phenylene sulfide) polymer, an amorphous polymer, and optionally a plasticizer, heating the resulting mixture, extruding or optionally casting the mixture into a membrane, controlled cooling (quenching) or coagulating the membrane, and leaching the membrane, while optionally drawing the membrane before, during, and/or after leaching.
    Type: Grant
    Filed: February 3, 1993
    Date of Patent: March 30, 1999
    Assignee: The Dow Chemical Company
    Inventors: Robert D. Mahoney, Jiro Kawamoto, Richard A. Lundgard, Mark F. Sonnenschein, Hawk S. Wan, H. Nelson Beck
  • Process of making microporous hollow fiber or film membrane of poly(phenylene sulfide) (PPS)
    Patent number: 5246647
    Abstract: The present invention relates to a process for preparing a microporous permselective membrane from a poly(phenylene sulfide) (PPS) polymer, an organic compound which substantially solubilizes the PPS below its melting point to form a homogenous mixture, heating the resulting mixture, extruding or casting the mixture into a membrane (fiber or film), quenching or coagulating the membrane, and leaching the membrane, while optionally drawing the membrane before, during, after leaching, or a combination thereof. In one embodiment, the solvent optionally includes an organic non-solvent to assist in obtaining the desired microporsity. The permselective polymers are useful to separate gaseous or liquid components from a mixture of components.
    Type: Grant
    Filed: August 19, 1991
    Date of Patent: September 21, 1993
    Assignee: The Dow Chemical Company
    Inventors: Henry N. Beck, Robert D. Mahoney, Hawk S. Wan, Chieh-Chun Chau, Timothy M. Finney, Ritchie A. Wessling, Jiro Kawamoto, Mark F. Sonnenschein
  • Process of making microporous membranes from poly(etheretherketone)-type polymers and low melting point crystallizable polymers
    Patent number: 5227101
    Abstract: The invention relates to a process for preparing a microporous membrane from an unsulfonated poly(etheretherketone)-type polymer by forming a mixture of an unsulfonated poly(etheretherketone)-type polymer, a low melting point crystallizable polymer, and a plasticizer, heating the resulting mixture, extruding or casting the mixture into a membrane, quenching or coagulating the membrane, and leaching the membrane, while optionally drawing the membrane before, during, after leaching, or a combination thereof.
    Type: Grant
    Filed: December 21, 1990
    Date of Patent: July 13, 1993
    Assignee: The Dow Chemical Company
    Inventors: Robert D. Mahoney, H. Nelson Beck, Richard A. Lundgard, Hawk S. Wan, Jiro Kawamoto, Mark F. Sonnenschein