Patents by Inventor Annie W. Wigfall

Annie W. Wigfall 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).

  • Antimicrobial particles of silver and barium sulfate or zinc oxide
    Patent number: 5595750
    Abstract: An antimicrobial composition comprising an inorganic particle with a first coating providing antimicrobial properties and a second coating providing a protective function is disclosed with a method for preparing the same and uses; further processes for producing polymeric articles and a method for controlling microorganisms are also disclosed.
    Type: Grant
    Filed: December 21, 1994
    Date of Patent: January 21, 1997
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Howard W. Jacobson, Michael H. Scholla, Annie W. Wigfall
  • Antimicrobial compositions, process for preparing the same and use
    Patent number: 5503840
    Abstract: An antimicrobial composition of titanium dioxide, barium sulfate, zinc oxide particles, and mixtures thereof having successive coatings of silver, in some cases a coating of zinc and/or copper compounds such as zinc oxide, copper (II) oxide and zinc silicate; silicon dioxide; alumina; and a dispersion aid such as dioctyl azelate.
    Type: Grant
    Filed: October 20, 1993
    Date of Patent: April 2, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Howard W. Jacobson, Michael H. Scholla, Annie W. Wigfall