Patents by Inventor Susan E. Bieker

Susan E. Bieker 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).

  • Hydraulic system having low speed operation
    Patent number: 9366272
    Abstract: A hydraulic fan circuit is provided. The hydraulic fan circuit includes a tank, a motor having a fluid inlet and a fluid outlet and a pump to draw fluid at a low pressure from the tank and discharge the fluid at elevated pressures to the motor via the fluid inlet. The hydraulic fan circuit further includes a directional control valve disposed between the fluid outlet of the motor and the tank. The directional control valve is operable to move between a flow blocking position and a flow passing position. Further, the directional control valve is configured to reduce a positive speed of the motor below a lowest positive speed attainable through control of pump output. Furthermore, the hydraulic fan circuit includes a pressure control circuit configured to provide a pilot fluid flow at varying pressure to move the directional control valve.
    Type: Grant
    Filed: August 9, 2013
    Date of Patent: June 14, 2016
    Assignee: Caterpillar Inc.
    Inventors: Susan E. Bieker, Eric P. Jakubiak, Dennis R. Barber, John J. Kaufman, Edward W. Mate, Scott D. Vollmer, Michael D. Hudson, Moses I. Akpan
  • HYDRAULIC SYSTEM HAVING LOW SPEED OPERATION
    Publication number: 20150040548
    Abstract: A hydraulic fan circuit is provided. The hydraulic fan circuit includes a tank, a motor having a fluid inlet and a fluid outlet and a pump to draw fluid at a low pressure from the tank and discharge the fluid at elevated pressures to the motor via the fluid inlet. The hydraulic fan circuit further includes a directional control valve disposed between the fluid outlet of the motor and the tank. The directional control valve is operable to move between a flow blocking position and a flow passing position. Further, the directional control valve is configured to reduce a positive speed of the motor below a lowest positive speed attainable through control of pump output. Furthermore, the hydraulic fan circuit includes a pressure control circuit configured to provide a pilot fluid flow at varying pressure to move the directional control valve.
    Type: Application
    Filed: August 9, 2013
    Publication date: February 12, 2015
    Applicant: Caterpillar Inc.
    Inventors: Susan E. Bieker, Eric P. Jakubiak, Dennis R. Barber, John J. Kaufman, Edward W. Mate, Scott D. Vollmer, Michael D. Hudson, Moses I. Akpan