Patents by Inventor John D. R. McQuillin

John D. R. McQuillin 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).

  • Thin film magneto-resistive apparatus for effecting readout from magnetic memory devices
    Patent number: 4384346
    Abstract: The present invention provides thin film magneto-resistive readout apparatus for providing readout from magnetic memory devices such as magnetic tapes, the apparatus comprising a thin film magneto-resistive readout head element, a narrow pulse generator for applying sensing current to the readout head element in the form of trains of narrow pulses, and a signal averaging circuit connected to receive output signals from the readout head element for deriving an average output signal for the pulses in each train.
    Type: Grant
    Filed: December 5, 1980
    Date of Patent: May 17, 1983
    Assignee: The Secretary of State for Industry in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
    Inventors: Alan J. Collins, John D. R. McQuillin