Patents by Inventor Greta Dewitte

Greta Dewitte 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).

  • Emulsifier free aqueous emulsion polymerization process for making fluoropolymers
    Patent number: 7074862
    Abstract: Emulsifier free fluoropolymer manufacturing method in which (a) a chain transfer agent, or a mixture of chain transfer agents are used wherein the chain transfer agents do not yield more than 0.4 weight % relative to the monomer feed of water soluble fluorinated compounds, or (b) a chain transfer agent or a mixture of chain transfer agents selected from alkanes, dialkyl ethers, hydrofluoroethers and/or hydrofluorocarbons.
    Type: Grant
    Filed: April 30, 2002
    Date of Patent: July 11, 2006
    Assignee: 3M Innovative Properties Company
    Inventors: Harald Kaspar, Klaus Hintzer, Greta Dewitte, Werner Schwertfeger
  • Emulsifier free aqueous emulsion polumerization process for making fluoropolymers
    Publication number: 20040132939
    Abstract: Emulsifier free fluoropolymer manufacturing method in which (a) a chain transfer agent, or a mixture of chain transfer agents are used wherein the chain transfer agents do not yield more than 0.4 weight % relative to the monomer feed of water soluble fluorinated compounds, or (b) a chain transfer agent or a mixture of chain transfer agents selected from alkanes, dialkyl ethers, hydrofluoroethers and/or hydrofluorocarbons.
    Type: Application
    Filed: October 9, 2003
    Publication date: July 8, 2004
    Inventors: Harald Kaspar, Klaus Hintzer, Greta Dewitte, Werner Schwertfeger
  • Polymer processing additive having improved stability
    Patent number: 6294604
    Abstract: The extrusion of polymeric materials, especially thermoplastic polymeric materials, requires a number of physical attributes in the polymer to be controlled during extrusion to effect desirable surface characteristics on the extruded polymer. Extrusion additives have been provided for the improvement of these attributes and characteristics. The present invention describes an additive system for extrudable thermoplastic polymers, extrudable polymer compositions containing the additive system, and extrusion processes using polymers containing the additive system of this invention. The extrusion additive of the present invention comprises: (i) a fluorocarbon polymer, (ii) a poly(oxyalkylene) polymer, (iii) magnesium oxide, and (iv) optionally a stabilizer. The extrudable composition of the invention comprises: (A) an extrudable polymer (e.g., a predominant amount, such as at least 50% by weight of solids), and (B) an effective amount of the stabilized processing aid (extrusion additive).
    Type: Grant
    Filed: March 6, 1998
    Date of Patent: September 25, 2001
    Assignee: Dyneon LLC
    Inventors: Koen Focquet, Greta Dewitte, Stephen E. Amos