Patents by Inventor John Gideon Hartnett

John Gideon Hartnett 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).

  • Temperature compensated oscillator
    Patent number: 7046099
    Abstract: An oscillator having a desired output frequency, comprising a cavity resonator 102 loaded with an anisotropic dielectric material and an oscillator circuit 100 including the cavity resonator 102 as a frequency determining element, the oscillator circuit 100 arranged to operate the cavity resonator 102 at a first frequency in a first mode and at a second frequency in a second mode, the first mode and the second mode each being influenced to a different extent by the thermal coefficient of permittivity of at least one crystal axis of the dielectric material, the oscillator circuit arranged to produce the desired operating frequency from the first frequency and the second frequency. The first frequency and the second frequency differ by an amount corresponding to the desired output frequency.
    Type: Grant
    Filed: April 30, 2004
    Date of Patent: May 16, 2006
    Assignees: Poseidon Scientific Instruments Pty Ltd, The University of Western Australia
    Inventors: Eugene Nikolay Ivanov, Michael Edmund Tobar, John Gideon Hartnett
  • Temperature compensated oscillator
    Publication number: 20040263268
    Abstract: An oscillator having a desired output frequency, comprising a cavity resonator 102 loaded with an anisotropic dielectric material and an oscillator circuit 100 including the cavity resonator 102 as a frequency determining element, the oscillator circuit 100 arranged to operate the cavity resonator 102 at a first frequency in a first mode and at a second frequency in a second mode, the first mode and the second mode each being influenced to a different extent by the thermal coefficient of permittivity of at least one crystal axis of the dielectric material, the oscillator circuit arranged to produce the desired operating frequency from the first frequency and the second frequency. The first frequency and the second frequency differ by an amount corresponding to the desired output frequency.
    Type: Application
    Filed: April 30, 2004
    Publication date: December 30, 2004
    Inventors: Eugene Nikolay Ivanov, Michael Edmund Tobar, John Gideon Hartnett