Patents by Inventor Peter Majewski

Peter Majewski 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).

  • Process for increasing the pinning force of superconducting Bi-Sr-Ca-Cu-O ceramic moldings
    Patent number: 5716909
    Abstract: Process for increasing the pinning force of superconducting Bi-Sr-Ca-Cu-O ceramic moldings, which comprises heating the pure-phase 2212 phase of a Bi-Sr-Ca-Cu-O ceramic molding under pure oxygen or an oxygen-containing gas for from 1 to 40 minutes to a temperature of from 825.degree. to 900.degree. C. and generating secondary-phase precipitates in the process.
    Type: Grant
    Filed: October 1, 1996
    Date of Patent: February 10, 1998
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Peter Majewski, Guenter Petzow, Fritz Aldinger, Bernhard Hettich, Steffen Elschner
  • Bismuth-containing superconducting material and process for producing it
    Patent number: 5250509
    Abstract: The invention relates to an oxide-ceramic superconducting material which contains bismuth, strontium, calcium and copper, having an overall composition of Bi.sub.y Ca.sub.2 Sr.sub.2 Cu.sub.3 O.sub.x, where y is an integer from 2.35 to 2.6 and x is about 10 to 12. The material has a critical temperature T above 105 K and has a proportion of the phase Bi.sub.2 Sr.sub.2 Ca.sub.2 Cu.sub.3 O.sub.x of at least 85% by volume. The invention also relates to a process for producing a bismuth-containing superconducting material which comprises holding the oxides or oxide precursors of bismuth, strontium, calcium and copper at a temperature in the range from 850.degree. to 890.degree. C. over a time span of a plurality of hours and adhering to the following atomic ratios:Bi:Cu>2:3Ca:Sr=0.9 to 1.50.SIGMA.(Sr+Ca):Cu=4.2:3 to 4:3.33Bi:.SIGMA.(Sr+Ca)=2.35:4 to 3.
    Type: Grant
    Filed: February 20, 1992
    Date of Patent: October 5, 1993
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Bernhard Hettich, Peter Majewski, Klaus Schulze, deceased, Gunter Petzow