Patents by Inventor Walter Thomas Krakowiak

Walter Thomas Krakowiak 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 build dispersions
    Patent number: 7619039
    Abstract: An aqueous dispersion of non-melt-processible fluoropolymer, process for making same and concentrated dispersion and powder obtained from the dispersion. The fluoropolymer particles of the dispersion have a standard specific gravity (SSG) of less than 2.225 and comprise a core of high molecular weight polytetrafluoroethylene and a shell of lower molecular weight polytetrafluoroethylene or modified polytetrafluoroethylene. At least about 1.5 weight % of the fluoropolymer particles comprise substantially rod-shaped particles having a length to diameter ratio greater than about 5.
    Type: Grant
    Filed: April 19, 2006
    Date of Patent: November 17, 2009
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Clay Woodward Jones, Robert John Cavanaugh, Walter Thomas Krakowiak, Richard A. Morgan, Theodore A. Treat
  • Core-shell fluoropolymer dispersions
    Patent number: 6841594
    Abstract: A dispersion of non-melt-processible fluoropolymer particles having an SSG of less than about 2.225 in aqueous medium. The fluoropolymer particles comprise a core of high molecular weight polytetrafluoroethylene having an average melt creep viscosity greater than about 1.5×1010 Pa·s and a shell of lower molecular weight polytetrafluoroethylene or modified polytetrafluoroethylene. The shell has an average melt creep viscosity greater than about 9×109 Pa·s and comprises about 5 to about 30% by weight of the particles. The fluoropolymer in the dispersion of the invention is fibrillating.
    Type: Grant
    Filed: March 13, 2002
    Date of Patent: January 11, 2005
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Clay Woodward Jones, Walter Thomas Krakowiak
  • Core-shell fluoropolymer dispersions
    Publication number: 20030129400
    Abstract: A dispersion of non-melt-processible fluoropolymer particles having an SSG of less than about 2.225 in aqueous medium. The fluoropolymer particles comprise a core of high molecular weight polytetrafluoroethylene having an average melt creep viscosity greater than about 1.5×1010 Pa·s and a shell of lower molecular weight polytetrafluoroethylene or modified polytetrafluoroethylene. The shell has an average melt creep viscosity greater than about 9×109 Pa·s and comprises about 5 to about 30% by weight of the particles. The fluoropolymer in the dispersion of the invention is fibrillating.
    Type: Application
    Filed: March 13, 2002
    Publication date: July 10, 2003
    Inventors: Clay Woodward Jones, Walter Thomas Krakowiak