Patents by Inventor Donald D. Tech

Donald D. Tech 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).

  • Patent number: 4088836
    Abstract: A gated oscillator is coupled to a set of headphones through a connector interposed between the headphone plug and a mating jack in a stereo receiver or other source of audio information. An acoustic pickup is coupled to the oscillator through circuitry which establishes a threshold for the oscillator. When a sound sufficiently loud to exceed a threshold is detected by the pickup, the oscillator is actuated and superimposes an audible tone on the audio information.
    Type: Grant
    Filed: May 18, 1977
    Date of Patent: May 9, 1978
    Assignee: Antech Industries
    Inventor: Donald D. Tech
  • Patent number: 4021776
    Abstract: A pattern recognition system includes a magnetic core correlator which is used for recognizing a pattern being scanned. A bit train of digital signals, describing the input image, is applied to a plurality of serially connected shift registers so that a train of pulses is stored in the shift registers. Selected bit positions from certain of the shift registers are connected to drivers which drive an array of magnetic cores with flux changes in a pattern corresponding with the stored input image. The array of magnetic cores has a group of sense lines, one sense line for each of the different patterns to be recognized. Each sense line has a winding on selected cores with the windings connected in series. Certain of the windings on a given sense line are aiding and the remaining windings are opposing so that the pattern of flux changes in the cores creates voltages on the windings which are additive when signals closely representing the pattern being recognized are applied to said drivers.
    Type: Grant
    Filed: November 19, 1974
    Date of Patent: May 3, 1977
    Assignee: Inforex, Inc.
    Inventor: Donald D. Tech