Patents by Inventor Muhammad S. Jahan

Muhammad S. Jahan 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).

  • Detection of surface impurity phases in high T.sub.C superconductors using thermally stimulated luminescence
    Patent number: 4873444
    Abstract: Detection of surface impurity phases in high-temperature superconducting materials. Thermally stimulated luminescence has been found to occur in insulating impurity phases which commonly exist in high-temperature superconducting materials. The present invention is sensitive to impurity phases occurring at a level of less than 1% with a probe depth of about 1 .mu.m which is the region of interest for many superconductivity applications. Spectroscopic and spatial resolution of the emitted light from a sample permits identification and location of the impurity species. Absence of luminescence, and thus of insulating phases, can be correlated with low values of rf surface resistance.
    Type: Grant
    Filed: November 23, 1988
    Date of Patent: October 10, 1989
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: D. Wayne Cooke, Muhammad S. Jahan