Patents by Inventor Douglas John Edwin Spencer

Douglas John Edwin Spencer 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).

  • Manufacturing process
    Patent number: 7772376
    Abstract: A process for the preparation of a desired chemical compound in a continuous reactor in which a part of the product stream exits the reactor and part of the product stream is recycled around the reactor in order to reduce the amount of buffer that would otherwise be required.
    Type: Grant
    Filed: July 18, 2005
    Date of Patent: August 10, 2010
    Assignee: Fujifilm Imaging Colorants Limited
    Inventors: David Martin Payne, Douglas John Edwin Spencer, John Heathcote Atherton, Zachary Richard Meadows
  • Manufacturing Process
    Publication number: 20090118478
    Abstract: A process for the preparation of a desired chemical compound in a continuous reactor in which a part of the product stream exits the reactor and part of the product stream is recycled around the reactor in order to reduce the amount of buffer that would otherwise be required.
    Type: Application
    Filed: July 18, 2005
    Publication date: May 7, 2009
    Applicant: FUJIFILM Imaging Colorants Limited
    Inventors: David Martin Payne, Douglas John Edwin Spencer, John Heathcote Atherton, Zachary Richard Meadows