Patents by Inventor Salem Haggag

Salem Haggag 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).

  • Dual mode hydraulic circuit control and method
    Patent number: 7874151
    Abstract: A dual mode control system for a hydraulic circuit (200) having a variable displacement pump (216) includes at least two actuators, each controlled by a respective valve. The valves are connected in series with a pressure sensor (250) measuring a pressure of fluid between the first valve (224) and the second valve (234) and relaying a signal to the electronic controller (202). The electronic controller (202) operates in a first mode, varying the displacement of the pump (216) based on a command signal operating at least one of the valves, and operates in a standby mode, varying the displacement of the pump (216) based on the signal from the sensor, when both valves are in their respective neutral positions.
    Type: Grant
    Filed: March 17, 2008
    Date of Patent: January 25, 2011
    Assignee: Caterpillar Inc
    Inventors: Hong-Chin Lin, Salem Haggag
  • Dual mode hydraulic circuit control and method
    Publication number: 20090229261
    Abstract: A dual mode control system for a hydraulic circuit (200) having a variable displacement pump (216) includes at least two actuators, each controlled by a respective valve. The valves are connected in series with a pressure sensor (250) measuring a pressure of fluid between the first valve (224) and the second valve (234) and relaying a signal to the electronic controller (202). The electronic controller (202) operates in a first mode, varying the displacement of the pump (216) based on a command signal operating at least one of the valves, and operates in a standby mode, varying the displacement of the pump (216) based on the signal from the sensor, when both valves are in their respective neutral positions.
    Type: Application
    Filed: March 17, 2008
    Publication date: September 17, 2009
    Applicant: CATERPILLAR INC.
    Inventors: Hong-Chin Lin, Salem Haggag