Patents by Inventor Lee Mahlum

Lee Mahlum 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).

  • Load dependent electronic valve actuator regulation and pressure compensation
    Patent number: 10183852
    Abstract: A hydraulic control system that uses system pressure information and a rescaled operator input to command valve spool area to control actuator speed. The system uses soft sealing and/or soft pressure compensation.
    Type: Grant
    Filed: June 15, 2016
    Date of Patent: January 22, 2019
    Assignee: Danfoss Power Solutions GMBH & CO OHG
    Inventors: Abhijit Das, Lee Mahlum, Luke Wadsley, Richard Hitchcock, Jeffrey A. Sipila, Larry Joachim
  • LOAD DEPENDENT ELECTRONIC VALVE ACTUATOR REGULATION AND PRESSURE COMPENSATION
    Publication number: 20170029256
    Abstract: A hydraulic control system that uses system pressure information and a rescaled operator input to command valve spool area to control actuator speed. The system uses soft sealing and/or soft pressure compensation.
    Type: Application
    Filed: June 15, 2016
    Publication date: February 2, 2017
    Inventors: Abhijit Das, Lee Mahlum, Luke Wadsley, Richard Hitchcock, Jeffrey A. Sipila, Larry Joachim
  • Hydraulic steering arrangement
    Patent number: 7159525
    Abstract: The invention concerns a hydraulic steering arrangement with a steering motor, a supply path between a pressure source and the steering motor, in which supply path a throttling device and a measuring motor are located, a return path between the steering motor and a pressure sink, in which return path a return throttle is located, and a bypass path, which connects the supply path and the return path on the pressure source end or the pressure sink end, respectively, and which has a bypass throttle. It is endeavoured to make such steering arrangements suitable for fast motorboats. For this purpose it is ensured that with a load on the steering motor the pressure drop over the bypass throttle is larger than the sum of the pressure drops between a point before the first throttle and a point after the last throttle of the throttling device.
    Type: Grant
    Filed: June 18, 2004
    Date of Patent: January 9, 2007
    Assignee: Sauer-Danfoss ApS
    Inventors: Poul Henning Holm Pedersen, Tom Rudolph, Lee Mahlum, Radoslaw Kornicki, Bjarne Schmidt
  • Hydraulic steering arrangement
    Publication number: 20050022522
    Abstract: The invention concerns a hydraulic steering arrangement with a steering motor, a supply path between a pressure source and the steering motor, in which supply path a throttling device and a measuring motor are located, a return path between the steering motor and a pressure sink, in which return path a return throttle is located, and a bypass path, which connects the supply path and the return path on the pressure source end or the pressure sink end, respectively, and which has a bypass throttle. It is endeavoured to make such steering arrangements suitable for fast motorboats. For this purpose it is ensured that with a load on the steering motor the pressure drop over the bypass throttle is larger than the sum of the pressure drops between a point before the first throttle and a point after the last throttle of the throttling device.
    Type: Application
    Filed: June 18, 2004
    Publication date: February 3, 2005
    Applicant: Sauer-Danfoss ApS
    Inventors: Poul Pedersen, Tom Rudolph, Lee Mahlum, Radoslaw Kornicki, Bjarne Schmidt