Patents by Inventor Eugene P. Virtue

Eugene P. Virtue 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).

  • Combined fixed and variable displacement pump system
    Patent number: 4050478
    Abstract: A hydraulic pump arrangement and control circuit for supplying fluid at high volume and a high pressure to a work circuit. The system utilizes a fixed displacement pump, a variable displcement pump, a dual pressure compensator, and an unloading valve working together to provide high pressure fluid delivery while reducing the horsepower requirements of the fixed displacement pump and the variable displacement pump. High flow is provided through the utilization of the combined pumps and high pressure is attained through the unloading of the fixed displacement pump through the unloading valve and destroking of the variable displacement pump in response to signals provided by the dual pressure compensator.
    Type: Grant
    Filed: May 4, 1976
    Date of Patent: September 27, 1977
    Assignee: International Harvester Company
    Inventors: Eugene P. Virtue, Richard J. Lech
  • Combined fixed and variable displacement pump system
    Patent number: 3985472
    Abstract: A hydraulic pump arrangement and control circuit for supplying fluid at high volume and a high pressure to a work circuit. The system utilizes a fixed displacement pump, a variable displacement pump, a dual pressure compensator, and an unloading valve working together to provide high pressure fluid delivery while reducing the horsepower requirements of the fixed displacement pump and the variable displacement pump. High flow is provided through the utilization of the combined pumps and high pressure is attained through the unloading of the fixed displacement pump through the unloading valve and destroking of the variable displacement pump in response to signals provided by the dual pressure compensator.
    Type: Grant
    Filed: April 23, 1975
    Date of Patent: October 12, 1976
    Assignee: International Harvester Company
    Inventors: Eugene P. Virtue, Richard J. Lech