Patents by Inventor Gustaf Andrew Johnson

Gustaf Andrew Johnson 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).

  • Cooler bypass valve assembly for hydraulic system return circuit
    Patent number: 11719265
    Abstract: A work machine includes a frame, a traction system supporting the frame, an implement system supported by the frame, and a hydraulic system. The hydraulic system includes a hydraulic oil tank, a control circuit, an oil cooler, and a cooler bypass valve assembly. The cooler bypass valve assembly is connected to the control circuit by a control circuit return line, and includes an unloading valve configured to allow hydraulic oil to flow from the control circuit return line to the hydraulic oil tank if a pressure of hydraulic oil in the control circuit return line exceeds a first threshold, a backpressure valve configured to allow hydraulic oil to flow from the return line to the oil cooler through an oil cooler inlet line if a pressure of hydraulic in the oil control circuit return line exceeds a second threshold, and an orifice configured to limit the flow of hydraulic oil through the backpressure valve.
    Type: Grant
    Filed: May 14, 2021
    Date of Patent: August 8, 2023
    Assignee: Caterpillar Inc.
    Inventors: Gustaf Andrew Johnson, Pengfei Ma, Jordan Garrity
  • COOLER BYPASS VALVE ASSEMBLY FOR HYDRAULIC SYSTEM RETURN CIRCUIT
    Publication number: 20220364581
    Abstract: A work machine includes a frame, a traction system supporting the frame, an implement system supported by the frame, and a hydraulic system. The hydraulic system includes a hydraulic oil tank, a control circuit, an oil cooler, and a cooler bypass valve assembly. The cooler bypass valve assembly is connected to the control circuit by a control circuit return line, and includes an unloading valve configured to allow hydraulic oil to flow from the control circuit return line to the hydraulic oil tank if a pressure of hydraulic oil in the control circuit return line exceeds a first threshold, a backpressure valve configured to allow hydraulic oil to flow from the return line to the oil cooler through an oil cooler inlet line if a pressure of hydraulic in the oil control circuit return line exceeds a second threshold, and an orifice configured to limit the flow of hydraulic oil through the backpressure valve.
    Type: Application
    Filed: May 14, 2021
    Publication date: November 17, 2022
    Applicant: Caterpillar Inc.
    Inventors: Gustaf Andrew Johnson, Pengfei Ma, Jordan Garrity