Superconductor technology: apparatus – material – process – Processes of producing or treating high temperature... – Shaping or consolidating
Reexamination Certificate
1993-12-21
2001-02-20
Fiorilla, Christopher A. (Department: 1731)
Superconductor technology: apparatus, material, process
Processes of producing or treating high temperature...
Shaping or consolidating
C264S614000, C505S491000, C505S500000
Reexamination Certificate
active
06191075
ABSTRACT:
The present invention is concerned generally with an article of manufacture and a method of manufacturing high temperature superconductors having improved transport properties. More particularly, the invention is concerned with an article and method of manufacture of high temperature superconductors having improved transport critical current density, or intergrain J
c
.
Development of useful high temperature superconductors has been difficult since the discovery of such superconductors. In order to be commercially useful, it is important to improve the transport critical current density of these superconductors. Grain boundaries in polycrystalline forms of these superconductors act as weak links, and thus the grain boundaries can drastically diminish current transport across the boundaries which degrades transport properties.
OBJECTS OF THE INVENTION
It is therefore an object of the invention to provide an improved form of high temperature superconductor.
It is another object of the invention to provide a novel article and method of manufacture of high temperature superconductor with improved transport properties.
It is a further object of the invention to provide an improved article and method of manufacture of a high temperature superconductor with improved intergrain critical current density properties.
It is still another object of the invention to provide a novel article and method of manufacture of a high temperature superconductor having nanophase paramagnetic particles disposed in the grain boundaries to diminish weak transport links.
These objects and other advantages and features of the invention will be readily apparent from the following description of the preferred embodiments, taken in conjunction with the accompanying drawings described hereinbelow.
REFERENCES:
patent: 4999338 (1991-03-01), Wijeyesekera et al.
patent: 5063201 (1991-11-01), Rao et al.
patent: 5202307 (1993-04-01), Hayashi
patent: 5262398 (1993-11-01), Nagata et al.
patent: 5284823 (1994-02-01), Chou et al.
“Magnetic Flux Exclusion Properties of Ferromagnetic/Superconductive Powder Composites,” R.B. Flippen, Solid State Communications, vol. 81, No. 1, pp. 105-107 (1992).
Askew Thomas R.
Balachandran Uthamalingam
Siegel Richard W.
Fiorilla Christopher A.
Foley & Lardner
Rechtin Michael D.
University of Chicago
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