Patents by Inventor William L. Lechter

William L. Lechter 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).

  • High TC copper-oxide superconductors comprising Tl-Sr-Ca-Cu-O
    Patent number: 5298484
    Abstract: High T.sub.c superconducting compounds are made by forming a reaction mixture of the oxides of Sr, Cu, Ca and Tl, compressing these into a hardened body, and placing the hardened body into a container. The container is then evacuated and sealed. The hardened body is heated under pressure until the oxides of Sr, Ca, Cu, and Tl react to form a superconducting compound.
    Type: Grant
    Filed: March 31, 1992
    Date of Patent: March 29, 1994
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: William L. Lechter, Michael S. Osofsky, Earl F. Skelton, Louis E. Toth
  • Method of making Tl-Sr-Ca-Cu-oxide superconductors comprising heating at elevated pressures in a sealed container
    Patent number: 5120704
    Abstract: High T.sub.c superconducting compounds are made by forming a reaction mixture of the oxides of Sr, Cu, Ca and Tl, compressing these into a hardened body, and placing the hardened body into a container. The container is then evacuated and sealed. The hardened body is heated under pressure until the oxides of Sr, Ca, Cu, and Tl react to form a superconducting compound.
    Type: Grant
    Filed: November 8, 1989
    Date of Patent: June 9, 1992
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: William L. Lechter, Michael S. Osofsky, Earl F. Skelton, Louis E. Toth
  • Process for single crystal growth of high T.sub.c superconductors
    Patent number: 5079220
    Abstract: Large oriented crystals greater than one millimeter in length of high T.sub.c superconducting compounds are grown by mixing starting materials in the correct proportions to make the superconducting compound, forming a mixture. The CO.sub.2 is removed from the mixture and the ternary oxide of the compound is formed from the mixture. Next, the mixture is formed into a self-supporting green body and sintered at a sintering temperature at which the top of the self-supporting green body is molten and the bottom surface is solid. The self-supporting green body is held at the sintering temperature for a time, forming a sintered body. Next, the sintered body is cooled so that crystals form. After this step, the crystals can be further processed to increase their superconducting properties. Finally, the crystals are removed and processed for use.
    Type: Grant
    Filed: May 25, 1989
    Date of Patent: January 7, 1992
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: William L. Lechter, Louis E. Toth, Badri N. Das, Stuart A. Wolf