Patents by Inventor Stuart R. Longley

Stuart R. Longley 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).

  • Evanescent-mode microwave oscillator
    Patent number: 4371849
    Abstract: A microwave evanescent-mode oscillator comprises a length of waveguide W1 having a cut-off frequency higher than the working frequency of the oscillator together with a Gunn element G disposed within the waveguide characterized in that the oscillator comprises, spaced in sequence along the waveguide a Gunn element G post-coupled into the waveguide and spaced from a first end of the waveguide, a capacitive member C and at the other end of the waveguide an end wall formed by a diaphragm D having therein an output aperture I for coupling out energy from the waveguide.
    Type: Grant
    Filed: March 19, 1980
    Date of Patent: February 1, 1983
    Assignee: U.S. Philips Corporation
    Inventor: Stuart R. Longley
  • Waveguide power limiter
    Patent number: 4218663
    Abstract: A waveguide power limiter comprising a ferrite slab provided with one or more cavities containing dielectric inserts. The slab is positioned in a waveguide and the cavities may be graded so that different portions of the slab have different power limiting ranges.
    Type: Grant
    Filed: March 13, 1978
    Date of Patent: August 19, 1980
    Assignee: U.S. Philips Corporation
    Inventors: Leonard K. Brundle, Stuart R. Longley, Michael D. Coleman