Patents by Inventor Darin C. Graf

Darin C. Graf 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).

  • Portable dual field gradient force multichannel flow cytometer device with a dual wavelength low noise detection scheme
    Patent number: 8293089
    Abstract: Systems and methods for combining dielectrophoresis, magnetic forces, and hydrodynamic forces to manipulate particles in channels formed on top of an electrode substrate are discussed. A magnet placed in contact under the electrode substrate while particles are flowing within the channel above the electrode substrate allows these three forces to be balanced when the system is in operation. An optical detection scheme using near-confocal microscopy for simultaneously detecting two wavelengths of light emitted from the flowing particles is also discussed.
    Type: Grant
    Filed: November 2, 2009
    Date of Patent: October 23, 2012
    Assignee: Sandia Corporation
    Inventors: Conrad D. James, Paul C. Galambos, Mark S. Derzon, Darin C. Graf, Kenneth R. Pohl, Chris J. Bourdon
  • Bridge permeameter
    Patent number: 5544520
    Abstract: A system for single-phase, steady-state permeability measurements of porous rock utilizes a fluid bridge arrangement analogous to a Wheatstone bridge. The arms of the bridge contain the sample and calibrated flow resistors.
    Type: Grant
    Filed: February 10, 1995
    Date of Patent: August 13, 1996
    Assignee: Sandia Corporation
    Inventors: Darin C. Graf, Norman R. Warpinski