Patents by Inventor Larisa R. Frenkel

Larisa R. Frenkel 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).

  • Apparatus with inductive loop synchronized oscillators for measuring the magnetic content of non-metallic samples
    Patent number: 4940939
    Abstract: An apparatus for measuring the magnetic content of non-metallic samples includes operating and reference sine wave oscillators of identical frequency, a mutual synchronization loop for said oscillators, and a phase meter connected to the oscillator outputs for measuring the phase shift between their oscillations, when a test sample is placed inside the inductance coil of the operating oscillator. The mutual synchronization loop includes a switchable resistive attenuator for varying the resistance of the mutual synchronization loop according to the magnetic content of the test sample, such that the phase shift between the oscillations of the oscillators, with any value of content within the specified measuring range, is not in excess of 30 deg.
    Type: Grant
    Filed: March 9, 1989
    Date of Patent: July 10, 1990
    Inventors: Alexandr L. Khait, Boris A. Glagovsky, Larisa R. Frenkel, Vera S. Los