Patents by Inventor Mark R. Freeman

Mark R. Freeman 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).

  • Fiber optic probe with a magneto-optic film on an end surface for detecting a current in an integrated circuit
    Patent number: 5451863
    Abstract: An apparatus and method for measuring the current distribution in an integrated circuit with high time resolution is described incorporating a magneto-optic film, a linearly polarized light beam and a means for measuring the magneto-optic polarization rotation of a light beam and circuitry for synchronizing test pulses in an integrated circuit. The invention overcomes the problem of determining current distribution as a function of time and location in an integrated circuit with 1 psec time resolution and 1 micrometer spatial resolution.
    Type: Grant
    Filed: October 30, 1992
    Date of Patent: September 19, 1995
    Assignee: International Business Machines Corporation
    Inventor: Mark R. Freeman