Patents by Inventor Mohamed Sherif Ghanem

Mohamed Sherif Ghanem 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).

  • Non-linear light-emitting load current control
    Patent number: 6400102
    Abstract: A sensor circuit detects a current supplied to a set of light-emitting diodes and produces a current reading dependent on the temperature of .operation of these light-emitting diodes. The sensor circuit comprises first and second serially interconnected resistors also connected in series with the set of light-emitting diodes. The sensor circuit also comprises a temperature-dependent impedance connected in parallel with one of the first and second resistors. At least a portion of the current through the set of light-emitting diodes flows through the sensor circuit to enable the first and second serially interconnected resistors and the temperature-dependent impedance to produce a variable voltage signal representative of the current through the set of light-emitting diodes, this variable voltage signal being dependent upon temperature. The above sensor circuit finds application in a substantially constant intensity light source.
    Type: Grant
    Filed: June 7, 2001
    Date of Patent: June 4, 2002
    Assignee: Gelcore, LLC
    Inventor: Mohamed Sherif Ghanem
  • Non-linear light-emitting load current control
    Publication number: 20020030455
    Abstract: A sensor circuit for detecting a current supplied to a non-linear light-emitting diode (LED) and for producing a current reading dependent on temperature. The sensor circuit comprises first and second serially interconnected resistors also connected in series with the LED, and a temperature-dependent impedance connected in parallel with one of the first and second resistors. At least a portion of the current through the LED flows through the sensor circuit to enable the first and second serially interconnected resistors and said temperature-dependent Impedance to produce a variable voltage signal representative of the current through the LED and dependent on temperature.
    Type: Application
    Filed: June 7, 2001
    Publication date: March 14, 2002
    Applicant: GELCORE, LLC
    Inventor: Mohamed Sherif Ghanem
  • Non-linear light-emitting load current control
    Patent number: 6285139
    Abstract: A sensor circuit detects a current supplied to a set of light-emitting diodes and produces a current reading dependent on the temperature of operation of these light-emitting diodes. The sensor circuit comprises first and second serially interconnected resistors also connected in series with the set of light-emitting diodes. The sensor circuit also comprises a temperature-dependent impedance connected in parallel with one of the first and second resistors. At least a portion of the current through the set of light-emitting diodes flows through the sensor circuit to enable the first and second serially interconnected resistors and the temperature-dependent impedance to produce a variable voltage signal representative of the current through the set of light-emitting diodes, this variable voltage signal being dependent upon temperature. The above sensor circuit finds application in a substantially constant intensity light source.
    Type: Grant
    Filed: December 23, 1999
    Date of Patent: September 4, 2001
    Assignee: Gelcore, LLC
    Inventor: Mohamed Sherif Ghanem