Patents by Inventor Douglas Vollrath

Douglas Vollrath 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).

  • Electrophoresis using contour-clamped electric fields
    Patent number: 5549796
    Abstract: A gel electrophoresis method and apparatus is described in which the shape and orientation of the electric field is controlled by contour clamping. Electrodes are arranged around a closed contour. Two or more electrodes, the driving electrodes, are clamped at a potential difference .phi..sub.0 to establish the general orientation and strength of the electric field. The remaining electrodes are clamped to intermediate potentials to control the shape of the field established by the driving electrodes. The field is varied in accordance with the purpose of the electrophoresis, depending upon the size of the particles and the information to be determined concerning the particles.
    Type: Grant
    Filed: May 11, 1994
    Date of Patent: August 27, 1996
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Gilbert Chu, Douglas Vollrath, Ron Davis
  • Electrophoresis using contour-clamped electric fields
    Patent number: 5165898
    Abstract: A gel electrophoresis method and apparatus is described in which the shape and orientation of the electric field is controlled by contour clamping. Electrodes are arranged around a closed contour. Two or more electrodes, the driving electrodes, are clamped at a potential difference .phi..sub.0 to establish the general orientation and strength of the electric field. The remaining electrodes are clamped to intermediate potentials to control the shape of the field established by the driving electrodes. The field is varied in accordance with the purpose of the electrophoresis, depending upon the size of the particles and the information to be determined concerning the particles.
    Type: Grant
    Filed: August 23, 1988
    Date of Patent: November 24, 1992
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Gilbert Chu, Douglas Vollrath, Ron Davis