Patents by Inventor A. David Hausfeld

A. David Hausfeld 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).

  • Isoelectric focusing techniques and devices
    Patent number: 4401538
    Abstract: An isoelectric focusing technique and apparatus employ an isoelectric focusing channel in which: (1) at least a portion of the channel wall extending between the anode and cathode compartments is constructed in such a way that electric lines of force pass through this portion while nevertheless a substantial component of the field is parallel the channel wall; and (2) this portion is selectively permeable to the ions of the electrolyte.
    Type: Grant
    Filed: June 2, 1981
    Date of Patent: August 30, 1983
    Inventor: A. David Hausfeld
  • Self-sustaining plasma discharge display device
    Patent number: 4160191
    Abstract: An improved display device of the Type using a self-sustained discharge as a source of electrons for cathodoluminescence is operable at relatively greater pressures so as to lower the necessary striking potential to the Paschen minimum and includes an improved grid structure for selectively controlling the transport of electrons from the sustained discharge to a high voltage screen, and constructed so as to limit positive ion space charge formation therebetween.
    Type: Grant
    Filed: December 27, 1977
    Date of Patent: July 3, 1979
    Inventor: A. David Hausfeld