Patents by Inventor Douglas F. G. Dwyer

Douglas F. G. Dwyer 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).

  • Surface acoustic wave accelerometer
    Patent number: 4621530
    Abstract: A differential surface acoustic wave (SAW) accelerometer comprises a resilient beam 1 one end of which is clamped in a support 2. Opposite faces of the beam are provided with SAW transducers 3, 4 and 6, 7 which respectively form delay lines driven by oscillator 5. Means are introduced for setting the beam into a low frequency mechanical flexural oscillation. The two outputs are connected in antiphase so that under conditions of no acceleration null points in the output waveform will be equally spaced. During acceleration the time intervals between successive nulls will become unequal.
    Type: Grant
    Filed: July 13, 1984
    Date of Patent: November 11, 1986
    Assignee: Standard Telephones and Cables Public Limited Company
    Inventors: Douglas F. G. Dwyer, David E. Bower
  • Surface acoustic wave accelerometer
    Patent number: 4598587
    Abstract: An accelerometer comprises a quartz beam 1 having on its upper and lower faces surface acoustic wave devices 2, 3 and 2', 3'. The beam is centrally mounted on quartz spacers 4, 5 which have metallized contacts for the lower SAW device. The spacers are carried on a quartz substrate 6 which is supported on a header 7 forming the base of a dual-in-line package. Mass-loading 8 is provided on each end of the beam 1.
    Type: Grant
    Filed: July 16, 1984
    Date of Patent: July 8, 1986
    Assignee: Standard Telephones & Cables, plc
    Inventors: Douglas F. G. Dwyer, David E. Bower