Patents by Inventor Mark M. Qandil

Mark M. Qandil 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).

  • Patent number: 6183208
    Abstract: A motor system using a totally enclosed fan-cooled (TEFC) electric motor to provide power. The motor enclosure may be sealed with a variety of sealing devices, including a double mechanical seal a single mechanical seal, a double lip seal injected with grease, a labyrinth seal, and/or a repeller positioned adjacent the motor enclosure. A release mechanism prevents the fan from creating excessive drag when the system is immersed in water. The fan cools the motor when the water level is below the motor, and the surrounding water combines with the fan to cool the motor when the water level rises to at least partially surround the motor. When the fan is at least partially immersed, the release mechanism substantially prevents the fan from imposing a load on the motor due to the surrounding water. The release mechanism can take the form of a shear key, a torque-release clutch or flexible fan blades. Alternatively, a separate fan motor may be provided for driving the cooling fan.
    Type: Grant
    Filed: January 28, 2000
    Date of Patent: February 6, 2001
    Assignee: Roper Holdings, Inc.
    Inventors: Mark M. Qandil, Robert B. Ray
  • Patent number: 6036434
    Abstract: A centrifugal pump having a rotatable impeller that operates to drain liquid into the intake of the pump. An air-introduction passage connects with a subatmospheric pressure region at the back of the impeller. Air introduced through this passage is mixed with a portion of the fluid pumped, and the air-fluid mixture is expelled as the discharge of the pump.
    Type: Grant
    Filed: October 15, 1997
    Date of Patent: March 14, 2000
    Assignee: Roper Holdings, Inc.
    Inventors: Robert B. Ray, Mark M. Qandil, Gary L. Olin
  • Patent number: 5591001
    Abstract: A centrifugal pump having a rotatable impeller that operates to drain liquid into the intake of the pump. An air-introduction passage connects with a subatmospheric pressure region at the back of the impeller. Air introduced through this passage is mixed with a portion of the fluid pumped, and the air-fluid mixture is expelled as the discharge of the pump.
    Type: Grant
    Filed: October 6, 1995
    Date of Patent: January 7, 1997
    Assignee: Cornell Pump Manufacturing Corporation
    Inventors: Robert B. Ray, Mark M. Qandil, Gary L. Olin