Patents by Inventor Kodidasu Umakantham

Kodidasu Umakantham 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).

  • Ferroelectric ceramic material with strong piezoelectric properties and a process of preparing the same
    Patent number: 6348160
    Abstract: The present invention relates to the preparation of compositions and/or ferroelectric ceramic materials having niobate anions in combination with lead, barium, lanthanum, and bismuth cations. In preferred embodiments, the compositions comprised the formula Pb(x−3y/2−3z/2)Ba(1−x)LayBizNb2O6, wherein x is from about 0.4 to about 0.6, y is from about 0.01 to about 0.03, and z is from about 0.01 to about 0.03. The compositions may be easily poled, and have unexpectedly high piezoelectric charge coefficients and unexpectedly high dielectric constants. The invention also provides processes for preparing the compositions, ferroelectric ceramic materials, and articles comprising the ferroelectric ceramic materials.
    Type: Grant
    Filed: June 2, 2000
    Date of Patent: February 19, 2002
    Assignee: Department of Science & Technology
    Inventors: Akella Bhanumathi, Vakkalanka Venkata Narasimhacharya, Kodidasu Umakantham