Patents by Inventor Ronald Koo

Ronald Koo 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: 7714661
    Abstract: A driver amplifier operative from a single DC voltage supply, coupled directly to the output load without the need for DC coupling capacitors used for preventing DC reaching the output load. An onboard power supply generates a negative voltage rail that powers the output amplifiers, allowing driver amplifier operation from both positive and negative rails. Since the amplifiers can be biased at ground potential (0 volts), no significant DC voltage exists across the load and the need for DC coupling capacitors is eliminated.
    Type: Grant
    Filed: May 6, 2008
    Date of Patent: May 11, 2010
    Assignee: Maxim Integrated Products, Inc.
    Inventors: Tony Doy, Ronald Koo
  • Publication number: 20070229169
    Abstract: A driver amplifier operative from a single DC voltage supply, coupled directly to the output load without the need for DC coupling capacitors used for preventing DC reaching the output load. An onboard power supply generates a negative voltage rail that powers the output amplifiers, allowing driver amplifier operation from both positive and negative rails. Since the amplifiers can be biased at ground potential (0 volts), no significant DC voltage exists across the load and the need for DC coupling capacitors is eliminated.
    Type: Application
    Filed: February 26, 2007
    Publication date: October 4, 2007
    Inventors: Tony Doy, Ronald Koo
  • Patent number: 7183857
    Abstract: A driver amplifier operative from a single DC voltage supply, coupled directly to the output load without the need for DC coupling capacitors used for preventing DC reaching the output load. An onboard power supply generates a negative voltage rail that powers the output amplifiers, allowing driver amplifier operation from both positive and negative rails. Since the amplifiers can be biased at ground potential (0 volts), no significant DC voltage exists across the load and the need for DC coupling capacitors is eliminated.
    Type: Grant
    Filed: January 18, 2005
    Date of Patent: February 27, 2007
    Assignee: Maxim Integrated Products Inc.
    Inventors: Tony Doy, Ronald Koo
  • Publication number: 20060280436
    Abstract: A video circuit including a video amplifier adapted to generate an amplified output video signal from an input video signal; a short detection circuit adapted to generate a first signal indicative of whether there is a short present at an output of the video amplifier; and a load detection circuit adapted to generate a second signal indicative of whether there is a load coupled to the output of the video amplifier. The video circuit may further include an input signal detection circuit adapted to generate a third signal indicative of whether an input video signal is present. The third signal generated by the input signal detection circuit may be used to enable the outputting of the first and second signals in order to prevent the false indication of faults at the output of the video amplifier in the absence of an input video signal.
    Type: Application
    Filed: June 10, 2005
    Publication date: December 14, 2006
    Inventors: Ronald Koo, Michael Petersen
  • Publication number: 20060220632
    Abstract: A system and method for configuring a video circuit into a low power consumption mode and a high power consumption mode. The system comprises an input signal detection circuit adapted to generate a first signal indicative of whether an input video signal is present at the input of the video circuit; an output load detection circuit adapted to generate a second signal indicative of whether a load is connected to the output of the video circuit; and a control device adapted to generate a third signal to control the power consumption mode of the video circuit in response to the first and second signals. The method entails detecting whether an input video signal is present; detecting whether the load is present; and configuring the video circuit for high power consumption if both the input video signal and the load are present, otherwise configuring the video circuit for low power consumption.
    Type: Application
    Filed: March 15, 2005
    Publication date: October 5, 2006
    Inventor: Ronald Koo
  • Publication number: 20050184807
    Abstract: A driver amplifier operative from a single DC voltage supply, coupled directly to the output load without the need for DC coupling capacitors used for preventing DC reaching the output load. An onboard power supply generates a negative voltage rail that powers the output amplifiers, allowing driver amplifier operation from both positive and negative rails. Since the amplifiers can be biased at ground potential (0 volts), no significant DC voltage exists across the load and the need for DC coupling capacitors is eliminated.
    Type: Application
    Filed: January 18, 2005
    Publication date: August 25, 2005
    Inventors: Tony Doy, Ronald Koo
  • Patent number: 4580079
    Abstract: A filament switching device is arranged to be mounted within the screw base of a conventional, dual-filament, incandescent light bulb. The device has a frame which branches around the evacuation tube of the bulb thereby allowing sufficient room for switching components within the device and yet avoiding interference with the evacuation tube of the bulb. Mounted within the frame of the switching device is a fixed contact and a cantilevered contact. The cantilevered contact can swing in a direction transverse to the evacuation tube to make electrical contact with the fixed contact. The cantilevered contact is held separated from the fixed contact by a fusible conductor. Upon failure of one of the filaments in the bulb, a surge of current flows through the fusible conductor, parting it and allowing the cantilevered contact to swing into electrical contact with the fixed contact. This swing of the cantilevered contact substitutes the failed filament with the other filament.
    Type: Grant
    Filed: May 7, 1984
    Date of Patent: April 1, 1986
    Inventor: Ronald Koo
  • Patent number: 4447760
    Abstract: A filament switching device is arranged to be mounted within the screw base of a conventional, dual-filament, incandescent light bulb. The device has a frame which branches around the evacuation tube of the bulb thereby allowing sufficient room for switching components within the device and yet avoiding interference with the evacuation tube of the bulb. Mounted within the frame of the switching device is a fixed contact and a cantilevered contact. The cantilevered contact can swing in a direction transverse to the evacuation tube to make electrical contact with the fixed contact. The cantilevered contact is held separated from the fixed contact by a fusible conductor. Upon failure of one of the filaments in the bulb a surge of current flows through the fusible conductor, parting it and allowing the cantilevered contact to swing into electrical contact with the fixed contact. This swing of the cantilevered contact substitutes the failed filament with the other filament.
    Type: Grant
    Filed: August 11, 1980
    Date of Patent: May 8, 1984
    Inventor: Ronald Koo
  • Patent number: 4160929
    Abstract: An incandescent lamp having a transparent heat mirror placed on the lamp envelope which transmits a substantial portion of the energy in the visible range produced by the lamp filament and which reflects back to the filament at least about 80%-85% of the infrared energy that the filament produces. In the preferred embodiment the transparent heat mirror is formed by a layered coating of TiO.sub.2 /Ag/TiO.sub.2 optimized for the operating temperature range of the filament. The filament is constructed to optically conform to the shape of the lamp envelope.
    Type: Grant
    Filed: March 25, 1977
    Date of Patent: July 10, 1979
    Assignee: Duro-Test Corporation
    Inventors: Luke Thorington, Peter Walsh, Ronald Koo, Wolfgang Thouret