Patents by Inventor Stephen J. Telfer

Stephen J. Telfer 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).

  • Color Electrophoretic Displays Using Same Polarity Reversing Address Pulse
    Publication number: 20170287407
    Abstract: An electrophoretic display comprising a fluid including a first species of particles and a charge control agent disposed between first and second electrodes. When a first addressing impulse have an electrical polarity is applied to the medium, the first species of particles move in one direction relative to the electric field, but when a second addressing impulse, larger than the first addressing impulse but having the same electrical polarity, is applied to the medium, the first species of particles move in the opposed direction relative to the electric field.
    Type: Application
    Filed: May 26, 2017
    Publication date: October 5, 2017
    Inventors: Stephen J. TELFER, Stephen BULL, Alain BOUCHARD, Craig A. HERB, Kosta LADAVAC, Ana L. LATTES, Jennifer M. MORRISON, Richard J. PAOLINI, JR., Michael Thomas REGAN, Luke M. SLOMINSKI, Lee YEZEK, Kenneth R. CROUNSE, J. Ryan KRUSE, Christopher L. HOOGEBOOM, Jason D. FEICK, David Darrell MILLER
  • METHODS FOR DRIVING COLOR ELECTROPHORETIC DISPLAYS
    Publication number: 20170287377
    Abstract: An electrophoretic medium includes a fluid, a first, light scattering particle (typically white) and second, third and fourth particles having three subtractive primary colors (typically magenta, cyan and yellow); at least two of these colored particles being non-light scattering. The first and second particles bear polymer coatings such that the electric field required to separate an aggregate formed by the third and the fourth particles is greater than that required to separate an aggregate formed from any other two types of particles. Methods for driving the medium to produce white, black, magenta, cyan, yellow, red, green and blue colors are also described.
    Type: Application
    Filed: May 23, 2017
    Publication date: October 5, 2017
    Inventors: Stephen J. TELFER, Richard J. PAOLINI, JR., Karl Raymond AMUNDSON, Kenneth R. CROUNSE, Alain BOUCHARD, Sunil Krishna SAINIS
  • Aggregate particles for use in electrophoretic color displays
    Patent number: 9778538
    Abstract: A multi-color display device has front and rear electrodes on opposed sides of an electrophoretic medium. The device has a voltage controller configured to apply a first and a smaller second potential difference, of either polarity, between the electrodes. The electrophoretic medium has first, second, and third species of particles of differing colors and charge polarities. The first and second particles move independently of one another in response to the first potential difference, but upon application of the second potential difference form charged aggregates, moving as a unit, having an aggregate color different from the first and second colors.
    Type: Grant
    Filed: December 9, 2016
    Date of Patent: October 3, 2017
    Assignee: E Ink Corporation
    Inventors: Stephen J. Telfer, Richard J. Paolini, Jr., George G. Harris, Isaac W. Moran, Alain Bouchard
  • METHODS FOR DRIVING ELECTRO-OPTIC DISPLAYS
    Publication number: 20170263175
    Abstract: A method for driving an electro-optic display having a front electrode, a backplane and a display medium positioned between the front electrode and the backplane, the method comprising of applying a first driving phase to the display medium, the first driving phase having a first signal and a second signal, the first signal having a first polarity, a first amplitude as a function of time, and a first duration, the second signal succeeding the first signal and having a second polarity opposite to the first polarity, a second amplitude as a function of time, and a second duration, such that the sum of the first amplitude as a function of time integrated over the first duration and the second amplitude as a function of time integrated over the second duration produces a first impulse offset.
    Type: Application
    Filed: March 9, 2017
    Publication date: September 14, 2017
    Inventors: Kenneth R. CROUNSE, Christopher L. HOOGEBOOM, Stephen J. TELFER
  • ELECTROPHORETIC PARTICLES AND PROCESSES FOR THE PRODUCTION THEREOF
    Publication number: 20170253742
    Abstract: Polymer shells similar to those described in U.S. Pat. No. 6,822,782 can be formed on pigment particles by (a) physi-sorping a reagent comprising polymerizable groups on to the pigment particles by treating the particle with a reagent having a polymerizable or polymerization-initiating group, such that the reagent will not desorb from the particle surface when the particle is placed in a hydrocarbon medium; or (b) treating pigment particles bearing nucleophilic groups with a reagent having a polymerizable or polymerization-initiating group, and an electrophilic group, thus attaching the polymerizable or polymerization-initiating groups to the particle surface. The zeta potential of the pigment particles can be varied by a process similar to (b) but using a reagent which does not have a polymerizable or polymerization-initiating group.
    Type: Application
    Filed: May 20, 2017
    Publication date: September 7, 2017
    Inventors: Lee Yezek, Andrew Drabek, Luke M. Slominski, Jennifer M. Morrison, Stephen J. Telfer, Brian Steinberg
  • ELECTROPHORETIC PARTICLES AND PROCESSES FOR THE PRODUCTION THEREOF
    Publication number: 20170253743
    Abstract: Polymer shells similar to those described in U.S. Pat. No. 6,822,782 can be formed on pigment particles by (a) physi-sorping a reagent comprising polymerizable groups on to the pigment particles by treating the particle with a reagent having a polymerizable or polymerization-initiating group, such that the reagent will not desorb from the particle surface when the particle is placed in a hydrocarbon medium; or (b) treating pigment particles bearing nucleophilic groups with a reagent having a polymerizable or polymerization-initiating group, and an electrophilic group, thus attaching the polymerizable or polymerization-initiating groups to the particle surface. The zeta potential of the pigment particles can be varied by a process similar to (b) but using a reagent which does not have a polymerizable or polymerization-initiating group.
    Type: Application
    Filed: May 20, 2017
    Publication date: September 7, 2017
    Inventors: Lee Yezek, Andrew Drabek, Luke M. Slominski, Jennifer M. Morrison, Stephen J. Telfer, Brian Steinberg
  • Electro-optic display with controlled electrochemical reactions
    Patent number: 9726957
    Abstract: An electro-optic display has a viewing surface through which a user views the display, a bistable, non-electrochromic electro-optic medium, and at least one electrode arranged to apply an electric field to the electro-optic medium, the display. The display comprises at least 10 micromoles per square meter of the viewing surface of at least one redox compound having an oxidation potential more negative that about 150 mV with respect to a standard hydrogen electrode, as measured at pH 8.
    Type: Grant
    Filed: January 10, 2014
    Date of Patent: August 8, 2017
    Assignee: E Ink Corporation
    Inventors: Stephen J. Telfer, Peter Carsten Bailey Widger, Ana L. Lattes, Dan John Lauber
  • Reverse driving pulses in electrophoretic displays
    Patent number: 9697778
    Abstract: An electrophoretic medium comprises a fluid and at least one species of particles disposed, When a first addressing impulse is applied to the medium, the first species of particles move in one direction relative to the electric field, but when a second addressing impulse, larger than the first addressing impulse, is applied to the medium, the first species of particles move in the opposed direction relative to the electric field.
    Type: Grant
    Filed: May 14, 2014
    Date of Patent: July 4, 2017
    Assignee: E Ink Corporation
    Inventors: Stephen J. Telfer, Stephen Bull, Alain Bouchard, Craig A. Herb, Kosta Ladavac, Ana L. Lattes, Jennifer M. Morrison, Richard J. Paolini, Jr., Michael Thomas Regan, Luke M. Slominski, Lee Yezek, Kenneth R. Crounse, J. Ryan Kruse, Christopher L. Hoogeboom, Jason D. Feick, David Darrell Miller
  • Electrophoretic particles and processes for the production thereof
    Patent number: 9688859
    Abstract: Polymer shells similar to those described in U.S. Pat. No. 6,822,782 can be formed on pigment particles by (a) physi-sorping a reagent comprising polymerizable groups on to the pigment particles by treating the particle with a reagent having a polymerizable or polymerization-initiating group, such that the reagent will not desorb from the particle surface when the particle is placed in a hydrocarbon medium; or (b) treating pigment particles bearing nucleophilic groups with a reagent having a polymerizable or polymerization-initiating group, and an electrophilic group, thus attaching the polymerizable or polymerization-initiating groups to the particle surface. The zeta potential of the pigment particles can be varied by a process similar to (b) but using a reagent which does not have a polymerizable or polymerization-initiating group.
    Type: Grant
    Filed: February 6, 2015
    Date of Patent: June 27, 2017
    Assignee: E Ink Corporation
    Inventors: Lee Yezek, Andrew A. Drabek, Luke M. Slominski, Jennifer M. Morrison, Stephen J. Telfer, Brian Steinberg
  • THREE-DIMENSIONAL DISPLAY
    Publication number: 20170160556
    Abstract: Three-dimensional displays are described using electrophoresis or electro-wetting media to modulate the total internal reflection of light in a waveguide.
    Type: Application
    Filed: December 6, 2016
    Publication date: June 8, 2017
    Inventors: Stephen J. Telfer, Stephen Bull
  • VARIABLE COLOR AND TRANSMISSION COVERINGS
    Publication number: 20170097555
    Abstract: Variable transmission covering systems that can be used, for example, to control the amount of light passing through a window in a building. Using transmissive electrophoretic media that can switch between a first and second optical state, the invention can be used to change the color and/or transmissivity of a structure (or structures) that is placed in front of an object. In some embodiments, the variable transmission system can change transmission and color on command.
    Type: Application
    Filed: September 30, 2016
    Publication date: April 6, 2017
    Inventors: Analisa L. LATTES, Stephen J. TELFER
  • AGGREGATE PARTICLES FOR USE IN ELECTROPHORETIC COLOR DISPLAYS
    Publication number: 20170090265
    Abstract: A multi-color display device has front and rear electrodes on opposed sides of an electrophoretic medium. The device has a voltage controller configured to apply a first and a smaller second potential difference, of either polarity, between the electrodes. The electrophoretic medium has first, second, and third species of particles of differing colors and charge polarities. The first and second particles move independently of one another in response to the first potential difference, but upon application of the second potential difference form charged aggregates, moving as a unit, having an aggregate color different from the first and second colors.
    Type: Application
    Filed: December 9, 2016
    Publication date: March 30, 2017
    Inventors: Stephen J. TELFER, Richard J. PAOLINI, JR., George G. HARRIS, Isaac W. MORAN, Alain BOUCHARD
  • CONTROLLED POLYMERIC MATERIAL CONDUCTIVITY FOR USE IN A TWO-PHASE ELECTRODE LAYER
    Publication number: 20170068125
    Abstract: An electro-optic assembly including a first and second substrate and a layer of electro-optic material disposed between the substrates. Each substrate includes a two-phase, light-transmissive, electrically-conductive layer comprising a first phase made of a highly electronically-conductive matrix and a second phase made of a polymeric material composition having a controlled volume resistivity.
    Type: Application
    Filed: November 16, 2016
    Publication date: March 9, 2017
    Inventors: Richard J. PAOLINI, JR., Stephen J. TELFER
  • DEVICES AND TECHNIQUES FOR ELECTRONICALLY ERASING A DRAWING DEVICE
    Publication number: 20170061895
    Abstract: Devices and techniques for electronically erasing an externally addressed electrophoretic drawing device are described. An electronically-erasable drawing device comprises an electro-optic display medium and interdigitated electrodes disposed adjacent one surface of the medium and configured to drive the medium to an intermediate (gray) optical state. A mobile electronic drawing implement may include electrodes configured to apply a fringing electric field to an electro-optic display medium from one side of the medium, the fringing electric field being arranged to drive a portion of the display medium adjacent the implement to an intermediate optical state, the electrodes being movable relative to the medium.
    Type: Application
    Filed: August 31, 2016
    Publication date: March 2, 2017
    Inventors: Richard J. Paolini, JR., Stephen J. Telfer
  • Aggregate particles for use in electrophoretic color displays
    Patent number: 9552780
    Abstract: A multi-color display device has front and rear electrodes on opposed sides of an electrophoretic medium. The device has a voltage controller configured to apply a first and a smaller second potential difference, of either polarity, between the electrodes. The electrophoretic medium has first and second species of particles of differing colors and charge polarities. The first and second particles move independently of one another in response to the first potential difference, but upon application of the second potential difference form charged aggregates, moving as a unit, having an aggregate color different from the first and second colors.
    Type: Grant
    Filed: June 7, 2016
    Date of Patent: January 24, 2017
    Assignee: E INK CORPORATION
    Inventors: Stephen J. Telfer, Richard J. Paolini, Jr., George G. Harris, Isaac W. Moran, Alain Bouchard
  • Controlled polymeric material conductivity for use in a two-phase electrode layer
    Patent number: 9529240
    Abstract: An electro-optic display containing a two-phase, light-transmissive electrically-conductive layer comprising a first phase made of a highly electronically-conductive matrix and a second phase made of a polymeric material composition having a controlled volume resistivity. The matrix of the first phase may be formed from carbon nanotubes, silver nanowires, a metal coated open foam structure, or a printed mesh of wires. The polymeric material composition of the second phase may be a conductive polymer, or a polymer and an additive such as a salt, a polyelectrolyte, a polymer electrolyte, or a solid electrolyte, or combinations thereof.
    Type: Grant
    Filed: January 16, 2015
    Date of Patent: December 27, 2016
    Assignee: E INK CORPORATION
    Inventors: Richard J. Paolini, Jr., Stephen J. Telfer
  • Thermal imaging members and methods
    Patent number: 9505255
    Abstract: There are described thermal imaging members and thermal imaging methods utilizing unsymmetrical rhodamine compounds. The rhodamine color-forming compounds exhibit a first color when in a crystalline form and a second color, different from the first color, when in an amorphous form.
    Type: Grant
    Filed: May 13, 2014
    Date of Patent: November 29, 2016
    Inventors: Michael P Filosa, Stephen J. Telfer, John L Marshall, Richard M Allen, John M Hardin
  • METHODS FOR DRIVING ELECTRO-OPTIC DISPLAYS
    Publication number: 20160321981
    Abstract: Methods for driving electro-optic displays, especially bistable displays, include (a) using two-part waveforms, the first part of which is dependent only upon the initial state of the relevant pixel; (b) measuring the response of each individual pixel and storing for each pixel data indicating which of a set of standard drive schemes are to be used for that pixel; (c) for at least one transition in a drive scheme, applying multiple different waveforms to pixels on a random basis; and (d) when updating a limited area of the display, driving “extra” pixels in an edge elimination region to avoid edge effects.
    Type: Application
    Filed: July 12, 2016
    Publication date: November 3, 2016
    Inventors: Demetrious Mark Harrington, Kenneth R. Crounse, Karl Raymond Amundson, Matthew J. Aprea, Theodore A. Sjodin, Alain Bouchard, Stephen J. Telfer, Ana L. Lattes, Yuval Ben-Dov
  • AGGREGATE PARTICLES FOR USE IN ELECTROPHORETIC COLOR DISPLAYS
    Publication number: 20160284278
    Abstract: A multi-color display device has front and rear electrodes on opposed sides of an electrophoretic medium. The device has a voltage controller configured to apply a first and a smaller second potential difference, of either polarity, between the electrodes. The electrophoretic medium has first and second species of particles of differing colors and charge polarities. The first and second particles move independently of one another in response to the first potential difference, but upon application of the second potential difference form charged aggregates, moving as a unit, having an aggregate color different from the first and second colors.
    Type: Application
    Filed: June 7, 2016
    Publication date: September 29, 2016
    Applicant: E INK CORPORATION
    Inventors: Stephen J. Telfer, Richard J. Paolini, JR., George G. Harris, Isaac W. Moran, Alain Bouchard
  • Color electro-optic displays
    Patent number: 9436056
    Abstract: A color filter array or a backplane for a color display has first and second areas with substantially different optical properties. The invention also provides a color filter with a low resistivity. The invention further provides a color display utilizing fluorescent or phosphorescent material.
    Type: Grant
    Filed: February 6, 2014
    Date of Patent: September 6, 2016
    Assignee: E Ink Corporation
    Inventors: Richard J. Paolini, Jr., Stephen J. Telfer