Patents by Inventor Robert C. Burkart

Robert C. Burkart 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).

  • IMPLANTABLE VENTRICULAR ASSIST DEVICES AND METHODS
    Publication number: 20240139497
    Abstract: Various aspects of the present disclosure are directed toward implantable medical devices, systems, and methods for cardiac assistance.
    Type: Application
    Filed: January 8, 2024
    Publication date: May 2, 2024
    Inventors: Scott M. Bryson, Dustin C. Burkart, Zachary A. Crannell, Joshua D. Cross, Robert M. Depue, James L. Goepfrich, Paul D. Goodman, Brandon C. Hedberg, Jason D. Hemmer, Jeffrey Kennington, Elton R. Migliati, Bryan Reep, Edward E. Shaw, James D. Silverman, Richard D. Strones
  • Positive feed drill
    Patent number: 4182588
    Abstract: A positive feed drill having an elongated spindle mounted for reversible longitudinal motion in a drill housing. The spindle has an hexagonal cross-section with the apices of the hexagon being threaded. A toothed drive gear having a hexagonal aperture centrally thereof has a close sliding fit with the spindle and is mounted for rotating the spindle. A feed gear having a threaded aperture centrally thereof is in threaded engagement with the spindle apices and is selectively rotated at a different rotational speed than the drive gear to longitudinally advance and retract the spindle. A gear for driving the feed gear is pin-slot locked to a motor gear for longitudinal spindle advancement, and is pin-slot locked to the housing for rapid spindle retraction. A pneumatic circuit in cooperation with limit valves and stop members provides completely automatic drilling to an adjustable depth, a dwell, and a positive retract operation with an economy of pneumatic energy.
    Type: Grant
    Filed: March 30, 1978
    Date of Patent: January 8, 1980
    Inventors: Robert C. Burkart, Gilbert J. Newbould
  • Positive feed drill
    Patent number: 4111590
    Abstract: A positive feed drill having an elongated spindle mounted for reversible longitudinal motion in a drill housing. The spindle has an hexagonal cross-section with the apices of the hexagon being threaded. A toothed drive gear having a hexagonal aperture centrally thereof has a close sliding fit with the spindle and is mounted for rotating the spindle. A feed gear having a threaded aperture centrally thereof is in threaded engagement with the spindle apices and is selectively rotated at a different rotational speed than the drive gear to longitudinally advance and retract the spindle. A gear for driving the feed gear is pin-slot locked to a motor gear for longitudinal spindle advancement, and is pin-slot locked to the housing for rapid spindle retraction. A pneumatic circuit in cooperation with limit valves and stop members provides completely automatic drilling to an adjustable depth, a dwell, and a positive retract operation with an economy of pneumatic energy.
    Type: Grant
    Filed: October 7, 1976
    Date of Patent: September 5, 1978
    Assignee: Robert E. Eash
    Inventors: Robert C. Burkart, Gilbert J. Newbould