Patents by Inventor David John Van Bramer

David John Van Bramer 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).

  • Synthesis of hexafluoropropylene
    Patent number: 6924403
    Abstract: The present invention relates to the process of pyrolyzing tetrafluoroethylene to hexafluoropropylene by carrying out the pyrolysis in a tubular reactor that is lined with either nickel or nickel alloy which contains no greater than 8 wt % chromium.
    Type: Grant
    Filed: May 7, 2003
    Date of Patent: August 2, 2005
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: John James Barnes, Kenneth Paul Kelch, Thomas D. Sandbrook, David John Van Bramer
  • Synthesis of hexafluoropropylene
    Publication number: 20040002621
    Abstract: The present invention relates to the process of pyrolyzing tetrafluoroethylene to hexafluoropropylene by carrying out the pyrolysis in a tubular reactor that is lined with either nickel or nickel alloy which contains no greater than 8 wt % chromium.
    Type: Application
    Filed: May 7, 2003
    Publication date: January 1, 2004
    Inventors: John James Barnes, Kenneth Paul Kelch, Thomas D. Sandbrook, David John Van Bramer
  • CO.sub.2 removable from fluorocarbons by semipermeable membrane
    Patent number: 6156097
    Abstract: A process for removing carbon dioxide from a fluorocarbon carbon dioxide mixture in which the fluorocarbon carbon dioxide mixture is contacted with a semipermeable polyimide membrane to form at least one exit stream having an increased concentration of carbon dioxide and at least one exit stream having a reduced concentration of carbon dioxide.
    Type: Grant
    Filed: May 1, 1998
    Date of Patent: December 5, 2000
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: William G. O'Brien, Charles J. Noelke, Raymond C. Harker, David John Van Bramer
  • Separation of CO.sub.2 from unsaturated fluorinated compounds by semipermeable membrane
    Patent number: 6123749
    Abstract: A process for separating carbon dioxide from an unsaturated fluorinated compound carbon dioxide mixture comprising contacting the unsaturated fluorinated compound carbon dioxide mixture with a semipermeable membrane to form at least one exit stream having an increased concentration of carbon dioxide and at least one other exit stream having a reduced concentration of carbon dioxide.
    Type: Grant
    Filed: May 1, 1998
    Date of Patent: September 26, 2000
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: William G. O'Brien, Charles J. Noelke, Raymond C. Harker, David John Van Bramer
  • Tetrafluoroethylene shipping/storage mixtures
    Patent number: 5866727
    Abstract: Tetrafluoroethylene is safely shipped or stored in the form of a liquid mixture with 35 to 65 mol % hexafluoropropylene.
    Type: Grant
    Filed: November 6, 1997
    Date of Patent: February 2, 1999
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: David John Van Bramer
  • Synthesis of tetrafluoroethylene
    Patent number: 5672784
    Abstract: In the process of pyrolyzing chlorodifluoromethane to form tetrafluoroethylene, yield is improved by having a controlled concentration of perfluorocyclobutane in the feed to pyrolysis.
    Type: Grant
    Filed: May 6, 1996
    Date of Patent: September 30, 1997
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Patrick Michael Murphy, Henry Max Schleinitz, David John Van Bramer