Patents by Inventor Meirion Francis Lewis

Meirion Francis Lewis 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).

  • Programable frequency acoustic wave discriminator
    Patent number: 4115744
    Abstract: An acoustic wave discriminator comprises an acoustic wave delay line having an input transducer and a plurality of output transducer separately connectable to a phase sensitive detector. This detector measures the phase difference between input and output transducers and provides an output for controlling the frequency of a voltage controlled oscillator. A plurality of different frequencies of the oscillator is obtained by connecting different output transducers of the discriminator to the phase sensitive detector.
    Type: Grant
    Filed: September 20, 1977
    Date of Patent: September 19, 1978
    Assignee: National Research Development Corporation
    Inventor: Meirion Francis Lewis
  • Multi-moded acoustic wave oscillator
    Patent number: 4078210
    Abstract: A multi-moded acoustic wave oscillator comprises an amplifier and feedback loop incorporating an acoustic wave delay line which may be a surface acoustic wave delay or bulk acoustic delay. Frequency of oscillation is changed in steps by taking different phased outputs from the delay line. This phase difference is achieved either by spacing surface acoustic wave transducers different distances on a substrate from an input transducer or by phase shift circuitry.
    Type: Grant
    Filed: April 8, 1976
    Date of Patent: March 7, 1978
    Assignee: National Research Development Corporation
    Inventor: Meirion Francis Lewis
  • Acoustic wave devices
    Patent number: 3950713
    Abstract: A surface acoustic wave delay line for use with an amplifier to form an oscillator has the spacing of its two transducers arranged to provide the desired mode of oscillation and the frequency responses of one or both transducers arranged to suppress unwanted moles of oscillation. Various transducers configuration are provided to reduce reflection problems between and within the transducers. The oscillator may be frequency modulated.
    Type: Grant
    Filed: February 14, 1974
    Date of Patent: April 13, 1976
    Assignee: National Research Development Corporation
    Inventor: Meirion Francis Lewis
  • Surface acoustic wave oscillators
    Patent number: 3936765
    Abstract: A surface acoustic wave oscillator comprises a surface acoustic wave delay line and amplifier. The phase difference between signals received from two transducers on the surface acoustic wave delay line is measured by a phase sensitive detector whose output is used to control a phase correction circuit. The oscillator may oscillate at a steady frequency or be frequency modulated.
    Type: Grant
    Filed: June 4, 1974
    Date of Patent: February 3, 1976
    Assignee: National Research Development Corporation
    Inventors: Meirion Francis Lewis, James Dennis Maines