Patents by Inventor Duane W. Marhefka

Duane W. Marhefka 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).

  • Patent number: 9134561
    Abstract: A drawing tablet device, utilizing a data capture device in connection with a pressure sensitive display, provides electronic information corresponding to images drawn on the pressure sensitive display to an external device. The drawing tablet includes a communication interface to couple the drawing tablet to the external device to transmit electronic information corresponding to images in real-time or as stored files.
    Type: Grant
    Filed: October 18, 2013
    Date of Patent: September 15, 2015
    Assignee: KENT DISPLAYS INCORPORATED
    Inventor: Duane W. Marhefka
  • Publication number: 20140043547
    Abstract: A drawing tablet device, utilizing a data capture device in connection with a pressure sensitive display, provides electronic information corresponding to images drawn on the pressure sensitive display to an external device. The drawing tablet includes a communication interface to couple the drawing tablet to the external device to transmit electronic information corresponding to images in real-time or as stored files.
    Type: Application
    Filed: October 18, 2013
    Publication date: February 13, 2014
    Applicant: Kent Displays Incorporated
    Inventor: Duane W. Marhefka
  • Patent number: 8502763
    Abstract: The invention features electronic skin including an active layer formed of bistable cholesteric liquid crystal material and articles comprising the skin, the electronic skin having uniform gray scale reflectivity. Also featured is method for producing suitable reduction pulses that will provide a display (e.g., the electronic skin) with uniform gray scale reflectivity. Reduction pulses of narrow width are used to create uniform levels of gray in the electronic skin to overcome display imperfections that cause discontinuity in the gray scale reflectivity.
    Type: Grant
    Filed: October 10, 2011
    Date of Patent: August 6, 2013
    Assignee: Manning Ventures, Inc.
    Inventors: Duane W. Marhefka, Nithya Venkatataman, Sankar Barua
  • Patent number: 8310630
    Abstract: The invention features electronic skin including an active layer formed of bistable cholesteric liquid crystal material and articles comprising the skin, the electronic skin having uniform gray scale reflectivity. Also featured is method for producing suitable reduction pulses that will provide a display (e.g., the electronic skin) with uniform gray scale reflectivity. Reduction pulses of narrow width are used to create uniform levels of gray in the electronic skin to overcome display imperfections that cause discontinuity in the gray scale reflectivity.
    Type: Grant
    Filed: May 16, 2008
    Date of Patent: November 13, 2012
    Assignee: Manning Ventures, Inc.
    Inventors: Duane W. Marhefka, Nithya Venkataraman, Sankar Barua
  • Publication number: 20120086735
    Abstract: The invention features electronic skin including an active layer formed of bistable cholesteric liquid crystal material and articles comprising the skin, the electronic skin having uniform gray scale reflectivity. Also featured is method for producing suitable reduction pulses that will provide a display (e.g., the electronic skin) with uniform gray scale reflectivity. Reduction pulses of narrow width are used to create uniform levels of gray in the electronic skin to overcome display imperfections that cause discontinuity in the gray scale reflectivity.
    Type: Application
    Filed: October 10, 2011
    Publication date: April 12, 2012
    Applicant: KENT DISPLAYS INCORPORATED
    Inventors: Duane W. MARHEFKA, Nithya VENKATARAMAN, Sankar BARUA
  • Publication number: 20090284691
    Abstract: The invention features electronic skin including an active layer formed of bistable cholesteric liquid crystal material and articles comprising the skin, the electronic skin having uniform gray scale reflectivity. Also featured is method for producing suitable reduction pulses that will provide a display (e.g., the electronic skin) with uniform gray scale reflectivity. Reduction pulses of narrow width are used to create uniform levels of gray in the electronic skin to overcome display imperfections that cause discontinuity in the gray scale reflectivity.
    Type: Application
    Filed: May 16, 2008
    Publication date: November 19, 2009
    Inventors: Duane W. Marhefka, Nithya Venkataraman, Sankar Barua
  • Patent number: 7479940
    Abstract: A display device includes an electronic display adapted to produce images, an electronic device that electrically communicates with the display and a zipper interconnect adapted to enable electrical connection between the display and the electronic device. The electronic display can be a reflective display such as a liquid crystal display or an emissive display such as one containing light emitting diodes. The electronic device that communicates with the display can be drive electronics adapted to electrically address the display so as to produce the images. In particular, the display is a cholesteric liquid crystal display that can be bistable and in the form of a passive matrix, active matrix or direct drive display.
    Type: Grant
    Filed: November 14, 2005
    Date of Patent: January 20, 2009
    Assignee: Kent Displays Incorporated
    Inventor: Duane W. Marhefka