Patents by Inventor Augusto Giustini

Augusto Giustini 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).

  • Device for measuring with direct current the total resistance of a circuit when there is also present an alternative component from the mains
    Patent number: 4090127
    Abstract: Instrument for measuring the total resistance of the protection circuit, that is to say of the phase-to-earth circuit the electric shock may possibly pass through. The modification made in Wheatstone's bridge (two condenser placed between the couples of vertices) allows a side of the bridge to be replaced through a circuit containing electromotive force. However, the alternate voltages involved do influence neither the direct ones utilized for measuring the unknown earth resistance nor the zero-instrument. Feeding is carried out through a Graetz bridge, to which a suitable resistance was added to avoid short-circuits on a side of the same bridge.
    Type: Grant
    Filed: September 23, 1976
    Date of Patent: May 16, 1978
    Inventor: Augusto Giustini