Patents by Inventor Robin L. Sheppard

Robin L. Sheppard 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).

  • Fluorescent treated external surface additives for toner
    Patent number: 6291121
    Abstract: Detection of the presence and amount of an external surface additive such as silica upon the surface of a toner is accomplished by treating the external surface additive with a fluorescent material and exposing the toner to ultraviolet light. This permits accurate quality control over the amount of the external surface additive required for the toner. The toner thus includes a binder resin and a colorant, and at least one external surface additive upon the surface of the toner, wherein the at least one external surface additive contains a fluorescent material. The fluorescent material may be a fluorescein dye.
    Type: Grant
    Filed: September 22, 2000
    Date of Patent: September 18, 2001
    Assignee: Xerox Corporation
    Inventors: William H. Hollenbaugh, Jr., Timothy L. Lincoln, Roger N. Ciccarelli, Thomas R. Pickering, Dwight J. Tshudy, Robin L. Sheppard, Amy L. Stamp
  • Capillary electrophoresis-mass spectrometry interface
    Patent number: 5856671
    Abstract: An interface for connecting an electrophoresis capillary to a mass spectrometer sprayer tube includes a first length of support tubing having an axial bore receiving and aligning the capillary and tube in end-abutting relationship at a junction. A solvent tube in a second length of support tubing intersects the first length of tubing in a T at the junction to supply makeup solvent to analyte flowing from the capillary to the sprayer tube. The tubing is secured in a T fitting which seals the tubing around the capillary, the sprayer tube, and the solvent tube.
    Type: Grant
    Filed: September 30, 1996
    Date of Patent: January 5, 1999
    Assignee: Cornell Research Foundation, Inc.
    Inventors: Jack D. Henion, Robin L. Sheppard, Timothy Wachs
  • Self-aligning liquid junction
    Patent number: 5587582
    Abstract: An interface for connecting an electrophoresis capillary to a mass spectrometer sprayer tube includes a first length of support tubing having an axial bore receiving and aligning the capillary and tube in end-abutting relationship at a junction. A solvent tube in a second length of support tubing intersects the first length of tubing in a T at the junction to supply makeup solvent to analyte flowing from the capillary to the sprayer tube. The tubing is secured in a T fitting which seals the tubing around the capillary, the sprayer tube, and the solvent tube.
    Type: Grant
    Filed: May 19, 1995
    Date of Patent: December 24, 1996
    Assignee: Cornell Research Foundation, Inc.
    Inventors: Jack D. Henion, Robin L. Sheppard, Timothy Wachs