Patents by Inventor Robert A. Graham

Robert A. Graham 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).

  • Method of dynamically controlling bottom hole circulation pressure in a wellbore
    Patent number: 6607042
    Abstract: A method of drilling a well having a first tubular member extending from the surface of the well to a position proximate the bottom of the well. The first tubular member has an inner annulus therethrough. A fluid is pumped into the well through the inner annulus of the first tubular member to flush drilling cuttings out of the well. A fluid is also injected into the well, exterior to the inner annulus, to control the bottom hole circulating pressure in the well.
    Type: Grant
    Filed: May 17, 2001
    Date of Patent: August 19, 2003
    Assignee: Precision Drilling Technology Services Group Inc.
    Inventors: Carel W. J. Hoyer, Robert A. Graham, Adrian Steiner
  • Method of dynamically controlling bottom hole circulation pressure in a wellbore
    Publication number: 20020170749
    Abstract: A method of drilling a well having a first tubular member extending from the surface of the well to a position proximate the bottom of the well. The first tubular member has an inner annulus therethrough. A fluid is pumped into the well through the inner annulus of the first tubular member to flush drilling cuttings out of the well. A fluid is also injected into the well, exterior to the inner annulus, to control the bottom hole circulating pressure in the well.
    Type: Application
    Filed: May 17, 2001
    Publication date: November 21, 2002
    Inventors: Carel W. J. Hoyer, Robert A. Graham, Adrian Steiner
  • Lithium niobate explosion monitor
    Patent number: 4893049
    Abstract: Monitoring explosive devices is accomplished with a substantially z-cut lithium niobate crystal in abutment with the explosive device. Upon impact by a shock wave from detonation of the explosive device, the crystal emits a current pulse prior to destruction of the crystal. The current pulse is detected by a current viewing transformer and recorded as a function of time in nanoseconds. In order to self-check the crystal, the crystal has a chromium film resistor deposited thereon which may be heated by a current pulse prior to detonation. This generates a charge which is detected by a charge amplifier.
    Type: Grant
    Filed: May 29, 1986
    Date of Patent: January 9, 1990
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Charles H. Bundy, Robert A. Graham, Stephen F. Kuehn, Richard R. Precit, Michael S. Rogers
  • Shock-activated electrochemical power supplies
    Patent number: 4783382
    Abstract: A shock-activated electrochemical power supply is provided which is initiated extremely rapidly and which has a long shelf life. Electrochemical power supplies of this invention are initiated much faster than conventional thermal batteries. Power supplies of this invention comprise an inactive electrolyte and means for generating a high-pressure shock wave such that the shock wave is propagated through the electrolytes rendering the electrolyte electrochemically active.
    Type: Grant
    Filed: April 20, 1987
    Date of Patent: November 8, 1988
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: William B. Benedick, Robert A. Graham, Bruno Morosin