Patents by Inventor Brian A. Pethica

Brian A. Pethica 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).

  • Solid-liquid separation using phase transitional N-substituted pyrrolidones
    Patent number: 6051143
    Abstract: A process is disclosed for flocculating particles in a liquid suspension by mixing the suspension with a pyrrolidone having alkyl, alkenyl, aryl, alkylaryl, and arylalkyl radicals from 1 to 18 carbon atoms to form a mixture at a temperature above a minimum flocculation temperature for the mixture.
    Type: Grant
    Filed: November 14, 1997
    Date of Patent: April 18, 2000
    Assignee: The Trustees of Columbia University in the City of New York
    Inventors: Ponisseril Somasundaran, Maltesh Chidambaram, Brian A. Pethica, Xiang Yu, Anjing Lou
  • Electromagnetic bioresponse by selective spectral suppression in pulsed field stimulation
    Patent number: 5338286
    Abstract: A noninvasive apparatus for treating living tissue and cells by means of a pulsed electromagnetic field, and particularly suitable for bone growth stimulation. A treatment coil is noninvasively mounted in proximity to an afflicted body part to be treated, and an electronic generator coupled to said treatment coil generates pulses having a positive pulse portion 200 to 250 microseconds in duration and a negative pulse portion having a duration less than approximately 50 microseconds, the pulses further characterized by a smooth transition at least from the leading edge to a relatively flat top segment. High-frequency content is substantially reduced, particularly at frequencies above 200 kHz.
    Type: Grant
    Filed: December 8, 1992
    Date of Patent: August 16, 1994
    Assignee: Electro-Biology, Inc.
    Inventors: Joan Abbott, Richard Cangialosi, Brian A. Pethica
  • Optimization of bone formation at cathodes
    Patent number: 5056518
    Abstract: A method including applying varying signals to a first electrode at the tissue site and a second electrode remote from the tissue site and monitoring the results to determine a distinctive transition in the current-voltage characteristics of the electrode pair. A signal is then selected and applied to the electrodes to operate beyond the transition. Periodically, a varying signal is applied to the electrodes and the monitoring process reperformed to determine a new transition and an appropriate signal is selected to operate beyond the transition.
    Type: Grant
    Filed: July 2, 1990
    Date of Patent: October 15, 1991
    Assignee: Electro-Biology, Inc.
    Inventors: Brian A. Pethica, James M. Devine, Anthony J. Varrichio
  • Optimization of bone formation at cathodes
    Patent number: RE35129
    Abstract: A method including applying varying signals to a first electrode at the tissue site and a second electrode remote from the tissue site and monitoring the results to determine a distinctive transition in the current-voltage characteristics of the electrode pair. A signal is then selected and applied to the electrodes to operate beyond the transition. Periodically, a varying signal is applied to the electrodes and the monitoring process reperformed to determine a new transition and an appropriate signal is selected to operate beyond the transition.
    Type: Grant
    Filed: October 15, 1993
    Date of Patent: December 19, 1995
    Assignee: Electro-Biology, Inc.
    Inventors: Brian A. Pethica, James M. Devine, Anthony J. Varrichio