Patents by Inventor Andre C Perras

Andre C Perras 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).

  • Precision AC current measurement shunts
    Patent number: 8111060
    Abstract: A more precise and cost effective means than previously commercially available for measuring alternating currents up to 100 amperes in the frequency range from direct current to 100 kilohertz can be measured with precision approaching 0.001% employs a shield around a resistive network. The shield is electrically isolated from the resistive network, but acts as a heat sink to draw heat generated by the resistive network away, promoting fast stabilization times. The shield also provides electrical shielding from outside interference allowing the geometric arrangement of elements in the resistive network to minimize induced inductance and capacitance.
    Type: Grant
    Filed: May 1, 2009
    Date of Patent: February 7, 2012
    Assignee: Guidline Instruments Limited
    Inventor: Andre C. Perras
  • High current precision resistance measurement system
    Patent number: 8106669
    Abstract: A resistance testing apparatus makes use of a modular design for cascaded, parallel, bipolar current sources to obviate the need for electromechanical or pneumatic switching systems.
    Type: Grant
    Filed: September 29, 2008
    Date of Patent: January 31, 2012
    Assignee: Guildline Instruments Limited
    Inventors: Andre C Perras, Mark Evans