Patents by Inventor Daniel E. Milligan

Daniel E. Milligan 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).

  • Compartmentalized MWD tool with isolated pressure compensator
    Patent number: 7673705
    Abstract: The present invention relates to a measurement-while-drilling (MWD) tool having a pressure compensation system and reservoir segregated from fluid integration with actuator mechanism lubricants. The MWD tool can also be serviced on the rig floor without the need to drain, reseal and charge the compensation system.
    Type: Grant
    Filed: June 6, 2008
    Date of Patent: March 9, 2010
    Assignee: The Gearhart Companies, Inc.
    Inventors: Marvin Gearhart, Daniel E. Milligan, Howard Smith, Dennis L. Naylor, Michael Redmond
  • Direct Drive MWD Tool
    Publication number: 20100025111
    Abstract: The present invention relates to a measurement-while-drilling tool [2] with a mechanically driven poppet [216] which eliminates the flow of drilling fluid through the tool, and reliance on surface supplied hydraulic force to activate the poppet [216]. The present invention eliminates the pilot valve system, and generates a fluid pulse from a direct drive relationship between a reversible motor [414], actuator [300], and poppet valve [216]. A pulser [200] has a push rod [214] slidably located inside. Poppet [216] is located on the push rod [214]. Actuator [300] is connected to the pulser [200], and has a ball screw [334] mechanically connected [330] to the push rod [214]. An electric motor [414] and gear train is operatively connected [338] [340] [342] to the ball screw [334]. Motor [414] generates linear movement of the poppet [216] in relation to an orifice [112] to restrict flow and generate a pulse.
    Type: Application
    Filed: July 23, 2009
    Publication date: February 4, 2010
    Inventors: Marvin GEARHART, Daniel E. MILLIGAN, Howard SMITH, Dennis L. NAYLOR, Michael REDMOND
  • COMPARTMENTALIZED MWD TOOL WITH ISOLATED PRESSURE COMPENSATOR
    Publication number: 20090301780
    Abstract: The present invention relates to a measurement-while-drilling (MWD) tool having a pressure compensation system and reservoir segregated from fluid integration with actuator mechanism lubricants. The MWD tool can also be serviced on the rig floor without the need to drain, reseal and charge the compensation system.
    Type: Application
    Filed: June 6, 2008
    Publication date: December 10, 2009
    Applicant: THE GEARHART COMPANIES, INC.
    Inventors: Marvin GEARHART, Daniel E. MILLIGAN, Howard SMITH, Dennis L. NAYLOR, Michael REDMOND