Patents by Inventor Richard B. Liebert

Richard B. Liebert 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).

  • Electrophoretic image display with reduced drives and leads
    Patent number: 4522472
    Abstract: An electrophoretic display device is described where a set of anode electrodes in an electrophoretic cell are disposed opposite row and column electrodes at a second side of the electrophoretic cell. The anode electrodes encompass equal pluralities of at least the row electrodes, and such equal pluralities of electrodes are connected in parallel. This significantly reduces the number of leads to the display.
    Type: Grant
    Filed: February 19, 1982
    Date of Patent: June 11, 1985
    Assignee: North American Philips Corporation
    Inventors: Richard B. Liebert, Roger P. White
  • X-Ray sensitive electrophoretic imagers
    Patent number: 4414679
    Abstract: A grid type substrate is constructed to support an X-ray sensitive material at one side of an electrophoretic display device. The grid structure may be X-ray absorbent material supported between X-ray transparent supports. Various arrangements of the X-ray absorbent grid may be provided.
    Type: Grant
    Filed: March 1, 1982
    Date of Patent: November 8, 1983
    Assignee: North American Philips Corporation
    Inventors: Richard B. Liebert, Johan W. Haarman
  • Electrophoretic image display having an improved switching time
    Patent number: 4071430
    Abstract: An electrophoretic visual display device using an electrophoretic suspension with pigment particles in a dielectric suspending liquid and a dye for contrasting color, all enclosed in a unit comprising a transparent electrode spaced from at least one segmented electrode by an insulating member; a mesh electrode in the shape of the segmented electrode having holes barely visible to the naked eye is positioned on the transparent layer between the layer and the segmented electrode.
    Type: Grant
    Filed: December 6, 1976
    Date of Patent: January 31, 1978
    Assignee: North American Philips Corporation
    Inventor: Richard B. Liebert