Patents by Inventor Elfi Waldschmidt

Elfi Waldschmidt 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).

  • Superconductors Bi-Sr-Cu-O
    Patent number: 4990488
    Abstract: Black crystal compositions having the empirical composition Bi.sub.a Sr.sub.b Cu.sub.c O.sub.d are described where a+b+c=1, A=0.36-0.557, b=0.098-0.496, c=0.1-0.4 and d=approximately 1+a/2. These compositions have a superconducting transition temperature T.sub.c for superconductivity of greater than 20 K and contain a principal phase which crystallizes in the orthorhombic system. They can be prepared from the mixture of the oxides in the atomic ratio stated by heating to 700.degree.-1000.degree. C.
    Type: Grant
    Filed: November 23, 1988
    Date of Patent: February 5, 1991
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hans-Georg von Schnering, Winfried Becker, Martin Schwarz, Leonhard Walz, Elfi Waldschmidt, Joachim Adam