Patents by Inventor Keith D. Campbell

Keith D. Campbell 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: 5326809
    Abstract: A method for preparing aqueous polymer emulsions in the presence of a poly[(vinyl alcohol)-co-(vinyl amine)] copolymer as a protective colloid and aqueous polymer emulsions containing a poly[(vinyl alcohol)-co-(vinyl amine)] copolymer.
    Type: Grant
    Filed: November 25, 1992
    Date of Patent: July 5, 1994
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Richard H. Bott, William E. Lenney, Keith D. Campbell, Jeffrey A. Kuphal, Chung-Ling Mao
  • Patent number: 5073175
    Abstract: The present invention provides a surface modified polymeric gas separation membrane having improved selectivity, particularly for oxygen/nitrogen gas mixtures, prepared by forming a membrane of a polymer having the structural formula ##STR1## wherein R and R" can be the same or different linear, branched or cyclic alkyl group having one to twelve carbon atoms, or R can be H, with the proviso that both R and R" cannot be methyl, and n is at least 100, and treating the surface of the membrane with a fluoro-oxidizing agent at conditions sufficient to fluoro-oxidize the membrane surface.
    Type: Grant
    Filed: August 9, 1988
    Date of Patent: December 17, 1991
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Madhu Anand, Pushpinder S. Puri, Keith D. Campbell, Christine A. Costello
  • Patent number: 5013338
    Abstract: A composite of a rigid, glassy, permeable membrane of a silyl or germyl-containing polyacetylene and a thin surface layer of a plasma polymerized monomer having pendant nitrogen heterocycles is provided; the composite has high flux and selectivity and is particularly useful for separating gas mixtures containing at least two components having different permeabilities through the composite structure.
    Type: Grant
    Filed: September 1, 1989
    Date of Patent: May 7, 1991
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Madhu Anand, Christine A. Costello, Keith D. Campbell