Patents by Inventor Thomas Luhman

Thomas Luhman 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).

  • Multiwire conductor having increased interwire resistance and good mechanical stability and method for making same
    Patent number: 4431862
    Abstract: An improved multiwire conductor of the type which is mechanically stabilized by a solder filler. A solder filled conductor is heated to a temperature sufficient to make the solder brittle, but below the melting point of the solder. While still hot, the conductor is flexed, causing the solder to separate from the wires comprising the conductor, thereby increasing the interwire resistance. In one embodiment the conductor may be heated to a temperature above the eutectic temperature of the solder so that a controlled amount of solder is removed. The subject invention is particularly suited for use with braided, ribbon-type, solder filled superconductors.
    Type: Grant
    Filed: March 15, 1982
    Date of Patent: February 14, 1984
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Thomas Luhman, Carl Klamut
  • Multiwire conductor having greatly increased interwire resistance and method for making same
    Patent number: 4426550
    Abstract: An improved multiwire conductor of the type which is mechanically stabilized by a tin based solder filler. A solder filled conductor is heated to a temperature above its melting point for a period long enough to allow a substantial amount of copper to be dissolved from the wires comprising the conductor. The copper forms the brittle intermetallic compound Cu.sub.5 Sn.sub.6 with tin in the solder. After cooling the conductor is flexed causing a random cracking of the solder, and thereby increasing the interwire resistance of the conductor. The subject invention is particularly adapted for use with braided, ribbon-type solder filled superconductors.
    Type: Grant
    Filed: March 15, 1982
    Date of Patent: January 17, 1984
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Thomas Luhman, Masaki Suenaga
  • Superconducting wire with improved strain characteristics
    Patent number: 4343867
    Abstract: A superconducting wire comprising a superconducting filament and a beryllium strengthened bronze matrix in which the addition of beryllium to the matrix permits a low volume matrix to exhibit reduced elastic deformation after heat treating which increases the compression of the superconducting filament on cooling and thereby improves the strain characteristics of the wire.
    Type: Grant
    Filed: July 20, 1981
    Date of Patent: August 10, 1982
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Thomas Luhman, Carl J. Klamut, Masaki Suenaga, David Welch
  • Superconducting wire with improved strain characteristics
    Patent number: 4324842
    Abstract: A superconducting wire comprising a superconducting filament and a beryllium strengthened bronze matrix in which the addition of beryllium to the matrix permits a low volume matrix to exhibit reduced elastic deformation after heat treating which increases the compression of the superconducting filament on cooling and thereby improve the strain characteristics of the wire.
    Type: Grant
    Filed: December 19, 1979
    Date of Patent: April 13, 1982
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Thomas Luhman, Carl J. Klamut, Masaki Suenaga, David Welch