Patents by Inventor George F. Diffendall

George F. Diffendall 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).

  • Purification of biochemically derived 1,3-propanediol
    Patent number: 7211699
    Abstract: The invention discloses a hydrogenation process for removing impurities and controlling acid for use in downstream processing of biochemically-derived 1,3-propanediol. Preferably, the biochemically-derived 1,3-propanediol, before the contacting, has an initial color and, after the contracting, has a color that is lower than the initial color.
    Type: Grant
    Filed: August 12, 2005
    Date of Patent: May 1, 2007
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Mayis Seapan, George F. Diffendall, Robert E. Trotter, Tyler T. Ames, F. Glenn Gallagher
  • Hydrogenation of biochemical derived 1,3 -propanediol
    Patent number: 7098368
    Abstract: The invention discloses a hydrogenation process for removing impurities and controlling acid for use in downstream processing of biochemically-derived 1,3-propanediol. Preferably, the biochemically-derived 1,3-propanediol, before the contacting, has an initial color and, after the contracting, has a color that is lower than the initial color.
    Type: Grant
    Filed: May 5, 2004
    Date of Patent: August 29, 2006
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Mayis Seapan, George F. Diffendall, Robert E. Trotter, Tyler T. Ames, F. Glenn Gallagher
  • Hydrogenation of chemically derived 1,3-propanediol
    Patent number: 7084311
    Abstract: Disclosed is a process comprising contacting chemical 1,3-propanediol with hydrogen in the presence of a hydrogenation catalyst. Preferably, the chemical 1,3-propanediol, before the contacting has an initial color and, after the contacting, has a color that is lower than the initial color.
    Type: Grant
    Filed: August 5, 2003
    Date of Patent: August 1, 2006
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Hari Babu Sunkara, Mayis Seapan, George F. Diffendall, Tyler T. Ames
  • Purification of chemical 1,3-propanediol
    Patent number: 7038092
    Abstract: Disclosed is a process comprising contacting chemical 1,3-propanediol with hydrogen in the presence of a hydrogenation catalyst. Preferably, the chemical 1,3-propanediol, before the contacting has an initial color and, after the contacting, has a color that is lower than the initial color.
    Type: Grant
    Filed: August 12, 2005
    Date of Patent: May 2, 2006
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Hari Babu Sunkara, Mayis Seapan, George F. Diffendall, Tyler T. Ames
  • Hydrogenation of biochemical derived 1,3 -propanediol
    Publication number: 20040260125
    Abstract: The invention discloses a hydrogenation process for removing impurities and controlling acid for use in downstream processing of biochemically-derived 1,3-propanediol. Preferably, the biochemically-derived 1,3-propanediol, before the contacting, has an initial color and, after the contracting, has a color that is lower than the initial color.
    Type: Application
    Filed: May 5, 2004
    Publication date: December 23, 2004
    Inventors: Mayis Seapan, George F. Diffendall, Robert E. Trotter, Tyler T. Ames, F. Glenn Gallagher
  • Hydrogenation of chemically derived 1,3-propanediol
    Publication number: 20040225161
    Abstract: Disclosed is a process comprising contacting chemical 1,3-propanediol with hydrogen in the presence of a hydrogenation catalyst. Preferably, the chemical 1,3-propanediol, before the contacting has an initial color and, after the contacting, has a color that is lower than the initial color.
    Type: Application
    Filed: August 5, 2003
    Publication date: November 11, 2004
    Inventors: Hari Babu Sunkara, Mayis Seapan, George F. Diffendall, Tyler T. Ames
  • Hydrogenation of polytrimethylene ether glycol
    Publication number: 20040225163
    Abstract: A process comprising contacting PO3G having color with hydrogen in the presence of a hydrogenation catalyst, wherein the PO3G, after hydrogenation, has a APHA color of less than about 50.
    Type: Application
    Filed: August 5, 2003
    Publication date: November 11, 2004
    Inventors: Hari Babu Sunkara, Mayis Seapan, George F. Diffendall, Francis G. Gallagher