Patents by Inventor Gregory Witkowski

Gregory Witkowski 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).

  • Microporous membrane having a macroporous support
    Patent number: 4963261
    Abstract: A porous structure comprising a macroporous support and a microporous membrane adhered to the outside surface of the support. Each of the support and membrane may be formed of a synthetic polymer, the polymers of the support and membrane usually being different from each other. The structure is formed by placing the membrane and a quantity of heat-fusible particles in contact with each other, and subjecting the membrane and particles to heat and pressure to fuse the particles into a macroporous support. The melting point of the membrane material should be no lower than that of the particle material.
    Type: Grant
    Filed: August 28, 1989
    Date of Patent: October 16, 1990
    Assignee: Chromex Corp.
    Inventors: Gregory Witkowski, Bamdad Bahar, Irving M. Wolbrom