Patents by Inventor Graham Redfearn

Graham Redfearn 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).

  • Pigmented inks for ink jet printers
    Patent number: 6958090
    Abstract: There is provided an aqueous ink jet ink composition suitable for use in continuous ink jet printers comprising: (a) a surface modified carbon black pigment; (b) at least one organic pigment; and (c) an aqueous carrier medium. The black aqueous pigment ink formulated in accordance with this composition provides a dried ink film whereof the resistivity is increased to a level whereby no printer failure or print defects are caused by electrical shorts when the printer has been out of use for a sufficient time to allow the ink to dry out in parts of the apparatus. The ink may also comprise at least one dispersant for the organic pigment.
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: October 25, 2005
    Assignee: ILFORD Imaging Switzerland GmbH
    Inventors: Graham Redfearn, Peter Edward Rose, Nicholas Alexander Walker
  • Pigmented inks for ink jet printers
    Publication number: 20030145761
    Abstract: There is provided an aqueous ink jet ink composition suitable for use in continuous ink jet printers comprising:
    Type: Application
    Filed: December 20, 2002
    Publication date: August 7, 2003
    Applicant: ILFORD IMAGING UK LIMITED.
    Inventors: Graham Redfearn, Peter Edward Rose, Nicholas Alexander Walker