Patents by Inventor Paul R. Alexander, Jr.

Paul R. Alexander, Jr. 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 efficiency air filtration media
    Patent number: 5336286
    Abstract: A high efficiency air filtration media comprises: about 5 to about 20% by weight of fibrids; about 5 to about 20% by weight of a binder; and about 60 to about 90% by weight of staple fiber. The media has a pressure drop of air across a face of the media of less than or equal to 0.4 inches of water. The media, also, has a sodium chloride particulate test for respirator filter percent efficiency of greater than or equal to 60%.
    Type: Grant
    Filed: April 26, 1993
    Date of Patent: August 9, 1994
    Assignee: Hoechst Celanese Corporation
    Inventors: Paul R. Alexander, Jr., Donald G. Cain, Erika J. Dougherty, Theodore S. Thornburg
  • Liquid/liquid extractions with microporous membranes
    Patent number: 4966707
    Abstract: The rate of mass transfer in liquid/liquid extractions can be increased by the appropriate selection of a solubilizing liquid to wet a microporous membrane. A solute is transferred between immiscible liquids across the membrane where and interface between the liquids is immobilized at a surface of the membrane.
    Type: Grant
    Filed: May 13, 1986
    Date of Patent: October 30, 1990
    Assignee: Celanese Corporation
    Inventors: Edward L. Cussler, Robert W. Callahan, Paul R. Alexander, Jr.