Patents by Inventor Trevor Maguire

Trevor Maguire 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: 5102345
    Abstract: The present invention describes a safety device for a socket portion of an electrical cord. The safety feature involves the positioning of a conducting ring around the positive slot on the receiving socket. The conducting ring is grounded, and when used in conjunction with a ground fault interrupter, prevents the completion of an electrical circuit through the child's saliva from the positive contact in the socket and the flesh of the child's mouth.
    Type: Grant
    Filed: June 10, 1991
    Date of Patent: April 7, 1992
    Assignee: University of Manitoba
    Inventors: Richard S. Stanwick, Trevor Maguire
  • Patent number: 4780622
    Abstract: Re-strike in the circuit breaker of a capacitive load applied across an AC voltage power supply is reduced or avoided by connecting across the capacitor bank a tuned discharge circuit. The tuned discharge circuit includes a transformer with a primary connected in parallel with the capacitor bank and a secondary which can be shorted through a switch. The leakage reactance of the transformer is equated to the capacitive reactance of the capacitor bank so that the tuned circuit discharges the capacitor voltage in phase with the supply voltage. The discharge takes place through a number of cycles thus gradually increasing the voltage across the breaker gap. The switch in the secondary preferably comprises an anti-parallel pair of thyristors fired by a circuit responsive to current zero in the capacitive circuit detected over a delay period to avoid firing at normal zero crossing current.
    Type: Grant
    Filed: January 11, 1988
    Date of Patent: October 25, 1988
    Assignee: Manitoba HVDC Research Centre
    Inventors: Dennis Woodford, Ahmed Glodjo, Trevor Maguire