Patents by Inventor Alexander J. Nytko

Alexander J. Nytko 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).

  • Manifold for reducing or generating pilot pressure for a pilot operated excavator
    Patent number: 11572902
    Abstract: A pilot hydraulic system may include a pilot pressure source, a pilot pressure return tank, a pilot valve, a pilot pressure supply line connecting the pilot pressure source to the pilot valve, and a pilot pressure return line connecting the pilot pressure return tank to the pilot valve. A main control valve may include a pilot chamber. A pilot pressure control line connects the pilot valve to the pilot chamber. A hydraulic sub-system is provided for modifying pilot pressure provided to the pilot chamber of the main control valve. The hydraulic sub-system may include a variable orifice valve disposed in the pilot pressure control line, a pilot pressure bypass line communicating the pilot pressure control line downstream of the variable orifice valve with the pilot pressure return line, and an electrohydraulic pressure reducing valve (EHPRV) disposed in the pilot pressure bypass line.
    Type: Grant
    Filed: July 6, 2021
    Date of Patent: February 7, 2023
    Assignee: Deere & Company
    Inventors: Alexander J. Nytko, Jeff Dobchuk, Kevin W. Campbell, Kristen D. Cadman
  • MANIFOLD FOR REDUCING OR GENERATING PILOT PRESSURE FOR A PILOT OPERATED EXCAVATOR
    Publication number: 20230010121
    Abstract: A pilot hydraulic system may include a pilot pressure source, a pilot pressure return tank, a pilot valve, a pilot pressure supply line connecting the pilot pressure source to the pilot valve, and a pilot pressure return line connecting the pilot pressure return tank to the pilot valve. A main control valve may include a pilot chamber. A pilot pressure control line connects the pilot valve to the pilot chamber. A hydraulic sub-system is provided for modifying pilot pressure provided to the pilot chamber of the main control valve. The hydraulic sub-system may include a variable orifice valve disposed in the pilot pressure control line, a pilot pressure bypass line communicating the pilot pressure control line downstream of the variable orifice valve with the pilot pressure return line, and an electrohydraulic pressure reducing valve (EHPRV) disposed in the pilot pressure bypass line.
    Type: Application
    Filed: July 6, 2021
    Publication date: January 12, 2023
    Inventors: Alexander J. Nytko, Jeff Dobchuk, Kevin W. Campbell, Kristen D. Cadman