Patents by Inventor David E. Bidstrup

David E. Bidstrup 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).

  • Reduced fuming fluoropolymer
    Patent number: 8658740
    Abstract: The present invention relates to the reduction of oligomer content of melt-processible fluoropolymer so that the fluoropolymer has at least 25 ppm less oligomer than the as-polymerized fluoropolymer.
    Type: Grant
    Filed: May 21, 2008
    Date of Patent: February 25, 2014
    Assignee: E I du Pont de Nemours and Company
    Inventors: Gregory Allen Chapman, David E. Bidstrup
  • Reduced Fuming Fluoropolymer
    Publication number: 20080221301
    Abstract: The present invention relates to the reduction of oligomer content of melt-processible fluoropolymer so that the fluoropolymer has at least 25 ppm less oligomer than the as-polymerized fluoropolymer.
    Type: Application
    Filed: May 21, 2008
    Publication date: September 11, 2008
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: Gregory Allen Chapman, David E. Bidstrup
  • Reduced fuming fluoropolymer
    Patent number: 7423087
    Abstract: The present invention relates to the reduction of oligomer content of melt-processible fluoropolymer so that the fluoropolymer has at least 25 ppm less oligomer than the as-polymerized fluoropolymer.
    Type: Grant
    Filed: April 30, 2004
    Date of Patent: September 9, 2008
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Gregory Allen Chapman, David E. Bidstrup
  • Process for the preparation of low fuming fluoropolymer
    Patent number: 7211629
    Abstract: The present invention relates to the reduction of oligomer content of melt-processible fluoropolymer so that the fluoropolymer has at least 25 ppm less oligomer than the as-polymerized fluoropolymer, the reduction being obtained by melting the fluoropolymer forming a surface of molten fluoropolymer and regenerating this surface, contacting the regenerating surface with inert gas, and devolatilizing the resultant molten fluoropolymer.
    Type: Grant
    Filed: April 30, 2004
    Date of Patent: May 1, 2007
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Gregory Allen Chapman, David E. Bidstrup
  • Reaction of fluoropolymer melts
    Patent number: 7208569
    Abstract: Chemical reactions are carried out with molten fluoropolymer, most conveniently in an extruder, wherein the reaction zone in the extruder is isolated from the melting zone, and the molten fluoropolymer is subdivided in the reaction zone sufficiently that contact and reaction between the reactant and the molten fluoropolymer in the reaction zone is essentially free of mass transfer limitation, followed by devolatilization in isolation from the reaction zone, and cooling the devolatilized fluoropolymer.
    Type: Grant
    Filed: October 22, 2003
    Date of Patent: April 24, 2007
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Gregory Allen Chapman, David E. Bidstrup
  • Reaction of fluoropolymer melts
    Patent number: 6838545
    Abstract: Chemical reactions are carried out with molten fluoropolymer, most conveniently in an extruder, wherein the reaction zone in the extruder is isolated from the melting zone, and the molten fluoropolymer is subdivided in the reaction zone sufficiently that contact and reaction between the reactant and the molten fluoropolymer in the reaction zone is essentially free of mass transfer limitation, followed by devolatilization in isolation from the reaction zone, and cooling the devolatilized fluoropolymer.
    Type: Grant
    Filed: November 8, 2002
    Date of Patent: January 4, 2005
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Gregory Allen Chapman, David E. Bidstrup
  • Reaction of fluoropolymer melts
    Publication number: 20040127651
    Abstract: Chemical reactions are carried out with molten fluoropolymer, most conveniently in an extruder, wherein the reaction zone in the extruder is isolated from the melting zone, and the molten fluoropolymer is subdivided in the reaction zone sufficiently that contact and reaction between the reactant and the molten fluoropolymer in the reaction zone is essentially free of mass transfer limitation, followed by devolatilization in isolation from the reaction zone, and cooling the devolatilized fluoropolymer.
    Type: Application
    Filed: October 22, 2003
    Publication date: July 1, 2004
    Inventors: Gregory Allen Chapman, David E. Bidstrup
  • Reaction of fluoropolymer melts
    Publication number: 20040092669
    Abstract: Chemical reactions are carried out with molten fluoropolymer, most conveniently in an extruder, wherein the reaction zone in the extruder is isolated from the melting zone, and the molten fluoropolymer is subdivided in the reaction zone sufficiently that contact and reaction between the reactant and the molten fluoropolymer in the reaction zone is essentially free of mass transfer limitation, followed by devolatilization in isolation from the reaction zone, and cooling the devolatilized fluoropolymer.
    Type: Application
    Filed: November 8, 2002
    Publication date: May 13, 2004
    Inventors: Gregory Allen Chapman, David E. Bidstrup