Patents by Inventor Bart de Graaff

Bart de Graaff 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).

  • Process for the preparation of 2,5-furandicarboxylic acid
    Patent number: 9938547
    Abstract: The invention is directed to a process for the preparation of 2,5-furandicarboxylic acid (FDCA) by fermentation comprising fermenting a suitable starting compound to produce an aqueous solution of a salt of FDCA having a pH of at least 7, optionally removing solids from said solution, e.g. by filtration, subsequently freeze crystallizing the said salt of FDCA from said solution at said pH, isolating the said FDCA salt in the form of solid crystals, preparing an aqueous solution of said salt and crystallizing FDCA as the free acid from said solution at an acidic pH.
    Type: Grant
    Filed: June 20, 2014
    Date of Patent: April 10, 2018
    Assignee: TECHNISCHE UNIVERSITEIT DELFT
    Inventors: Jacob van Spronsen, Geert-Jan Witkamp, Bart de Graaff
  • PROCESS FOR THE PREPARATION OF 2,5-FURANDICARBOXYLIC ACID
    Publication number: 20160145662
    Abstract: The invention is directed to a process for the preparation of 2,5-furandicarboxylic acid (FDCA) by fermentation comprising fermenting a suitable starting compound to produce an aqueous solution of a salt of FDCA having a pH of at least 7, optionally removing solids from said solution, e.g. by filtration, subsequently freeze crystallizing the said salt of FDCA from said solution at said pH, isolating the said FDCA salt in the form of solid crystals, preparing an aqueous solution of said salt and crystallizing FDCA as the free acid from said solution at an acidic pH.
    Type: Application
    Filed: June 20, 2014
    Publication date: May 26, 2016
    Applicant: Technische Universiteit Delft
    Inventors: Jacob van Spronsen, Geert-Jan Witkamp, Bart de Graaff