Patents by Inventor Lawrence Dudley Woolf

Lawrence Dudley Woolf 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).

  • Circuit for generating two distinctive tone bursts with exponentially decaying envelopes
    Patent number: 4057769
    Abstract: An electrical signal generator comprises an electric wave oscillator for producing oscillations at one or other of two predetermined frequencies, an attenuator device for attenuating oscillations produced by the oscillator in a manner which varies over a period of time, and control means for controlling the oscillator to produce a burst of oscillations at one said predetermined frequency and a subsequent burst of oscillations at the other said predetermined frequency. The control means controls the attenuator device increasingly to attenuate the oscillations over the period of each burst.
    Type: Grant
    Filed: September 14, 1976
    Date of Patent: November 8, 1977
    Assignee: Rediffusion Reditronics Limited
    Inventor: Lawrence Dudley Woolf