Patents by Inventor Philip J. Thurakal

Philip J. Thurakal 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: 5043678
    Abstract: A Phase Locked Loop including a monolithic Phase Locked Loop component. The monolithic component has an internal amplifier stage and an internal VCO. An external phase detector compares the phase of a reference signal to the phase of the output of the internal VCO to provide a signal which is a measure of the phase differences. The signal is filtered by an external filter, amplified by the internal amplifier stage and input to the internal VCO.
    Type: Grant
    Filed: December 27, 1989
    Date of Patent: August 27, 1991
    Assignee: Allied-Signal Inc.
    Inventor: Philip J. Thurakal
  • Patent number: 4677581
    Abstract: Analog input/output apparatus includes a plurality of digital to analog converters (18, 20, 22, 24, 26) and a plurality of interfacing means (4, 6, 8, 10, 12, 14, 16) for interfacing the converters with a central processing unit (2). A plurality of current and voltage sources (28, 30, 32, 34, 36, 38, 40, 42) are connected to the converters for providing a plurality of voltage and current stimuli signals and monitor signals. A signal measurement channel (44, 46, 48, 52) is responsive to the monitor signals and is controlled by the interfacing means (4-16), and multiplexers (44, 46) are wrapped around the measurement channel to provide a self-calibration channel (50). The central processing unit is responsive to the self-calibration channel output for determining the correction to be applied to the stimuli signals.
    Type: Grant
    Filed: May 30, 1985
    Date of Patent: June 30, 1987
    Assignee: Allied Corporation
    Inventors: Jacob H. Malka, Philip J. Thurakal
  • Patent number: 4633191
    Abstract: A transformer isolated high voltage, high power system is disclosed which is suitable for driving servo motors in servo loop control systems or the like. A D.C. current control loop is provided for preventing transformer saturation without gapping the transformer core. An output control loop is provided which minimizes signal crossover distortion and input/output phase shift. Crossover distortion adjustment is also implemented.
    Type: Grant
    Filed: August 22, 1985
    Date of Patent: December 30, 1986
    Assignee: Allied Corporation
    Inventors: Jacob H. Malka, Philip J. Thurakal