Patents by Inventor Roberto Antonio Zavatti

Roberto Antonio Zavatti 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).

  • Tamper resistant card enclosure with improved intrusion detection circuit
    Patent number: 6957345
    Abstract: A system for protecting an electronic device from mechanical intrusion attempt. An intrusion barrier able to detect mechanical intrusion by means of circuit traces which detect any change in the resistance characteristics of the electric circuit. These circuit traces function as a resistors and they are connected together to form a Wheatstone bridge. According to the present invention the logical lay-out of these connections is selected so that the voltage difference between two adjacent traces is minimized. In this way the current leakage effect is limited to the minimum.
    Type: Grant
    Filed: May 7, 2001
    Date of Patent: October 18, 2005
    Assignee: International Business Machines Corporation
    Inventors: Mario Leonardo Cesana, Roberto Antonio Zavatti
  • Tamper resistant card enclosure with improved intrusion detection circuit
    Publication number: 20010056542
    Abstract: A system for protecting an electronic device from mechanical intrusion attempt. An intrusion barrier able to detect mechanical intrusion by means of circuit traces which detect any change in the resistance characteristics of the electric circuit. These circuit traces function as a resistors and they are connected together to form a Wheatstone bridge. According to the present invention the logical lay-out of these connections is selected so that the voltage difference between two adjacent traces is minimized. In this way the current leakage effect is limited to the minimum.
    Type: Application
    Filed: May 7, 2001
    Publication date: December 27, 2001
    Applicant: International Business Machines Corporation
    Inventors: Mario Leonardo Cesana, Roberto Antonio Zavatti