Patent JPH0446781A successfully refreshed from Google Patents.
Patent US5920246A successfully refreshed from Google Patents.
US5920246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Superconductive composite materials
Assignee: Railway Technical Research Institute
•
Filing: 1997-03-19
•
Granted: 1999-07-06
•
Expires: 2017-03-19
Abstract
Abstract A composite material having a plurality of sections integrated into a unitary structure and each including a bulk of a superconductive metal oxide of RE--Ba--Cu--O wherein RE represents a rare earth element, the bulk of each of the sections having pinning centers and capable of trapping a magnetic field. A first one of the sections has a superconductive current density different from that of a second one of the sections. The composite material may be produced by assembling preformed respective sections into a unitary structure or by immersing one of the sections in a solution to grow crystal of Y--Ba--Cu--O superconductive on that section, followed by trimming.
Inventors
- 👤 Ken Nagashima
- 👤 Naomichi Sakai
- 👤 Sang-Im Yoo
- 👤 Hiroyuki Fujimoto
- 👤 Masato Murakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:49
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/20; H10N60/203; Y; Y10; Y10S; Y10S505/00; Y10S505/775; Y10S505/776
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
74 words
A composite material comprising a plurality of bulk superconductor sections integrated into a unitary structure, each of said sections including a bulk of a superconductive metal oxide of RE--Ba--Cu--O, wherein RE represents a rare earth element, said bulk of each of said sections having pinning centers and capable of trapping a magnetic field, a first one of said sections having a superconductive current density different from that of a second one of said sections.
Claim 2
Dependent Claim
74 words
A composite material comprising a plurality of bulk superconductor sections integrated into a unitary structure, each of said sections including a bulk of a superconductive metal oxide of RE--Ba--Cu--O, wherein RE represents a rare earth element, said bulk of each of said sections having pinning centers and capable of trapping a magnetic field, a first one of said sections having a superconductive current density different from that of a second one of said sections.
Claim 3
Dependent Claim
26 words
A composite material as claimed in claim 1, wherein said rare earth element RE in said first section is different from that in said second section.
Claim 4
Dependent Claim
40 words
A composite material as claimed in claim 1, wherein said first section shows a maximum superconductive current density at a relatively high magnetic field and said second section shows a maximum superconductive current density at a relatively high magnetic field.
Claim 5
Dependent Claim
125 words
A composite material comprising: a core section having an outer peripheral surface and including a first bulk of a superconductive metal oxide of RE--Ba--Cu--O wherein RE represents a rare earth element, said first bulk having pinning centers and capable of trapping a magnetic field, said first bulk showing a maximum superconductive current density at a relatively high magnetic field; and an outer section surrounding said outer periphery of said core section and including a second bulk of a superconductive metal oxide of RE--Ba--Cu--O wherein RE represents a rare earth element different from that of said first bulk, said second bulk having pinning centers and capable of trapping a magnetic field, said second bulk showing a maximum superconductive current density at a relatively low magnetic field.
Claim 6
Dependent Claim
125 words
A composite material comprising: a core section having an outer peripheral surface and including a first bulk of a superconductive metal oxide of RE--Ba--Cu--O wherein RE represents a rare earth element, said first bulk having pinning centers and capable of trapping a magnetic field, said first bulk showing a maximum superconductive current density at a relatively high magnetic field; and an outer section surrounding said outer periphery of said core section and including a second bulk of a superconductive metal oxide of RE--Ba--Cu--O wherein RE represents a rare earth element different from that of said first bulk, said second bulk having pinning centers and capable of trapping a magnetic field, said second bulk showing a maximum superconductive current density at a relatively low magnetic field.
Claim 7
Dependent Claim
20 words
A composite material as claimed in claim 4, wherein said first bulk is Nd--Ba--Cu--O, and said second bulk is Y--Ba--Cu--O.
Claim 8
Dependent Claim
142 words
A composite material comprising: a core section in the form of a layer having opposite sides and including a first bulk of a superconductive metal oxide of RE--Ba--Cu--O wherein RE represents a rare earth element, said first bulk having pinning centers and capable of trapping a magnetic field, said first bulk showing a maximum superconductive current density at a relatively high magnetic field; and two outer sections each in the form of a layer and provided on said opposite sides of said core section, each of said outer sections including a second bulk of a superconductive metal oxide of RE--Ba--Cu--O wherein RE represents a rare earth element different from that of said first bulk, said second bulk having pinning centers and capable of trapping a magnetic field, said second bulk showing a maximum superconductive current density at a relatively low magnetic field.
Claim 9
Dependent Claim
142 words
A composite material comprising: a core section in the form of a layer having opposite sides and including a first bulk of a superconductive metal oxide of RE--Ba--Cu--O wherein RE represents a rare earth element, said first bulk having pinning centers and capable of trapping a magnetic field, said first bulk showing a maximum superconductive current density at a relatively high magnetic field; and two outer sections each in the form of a layer and provided on said opposite sides of said core section, each of said outer sections including a second bulk of a superconductive metal oxide of RE--Ba--Cu--O wherein RE represents a rare earth element different from that of said first bulk, said second bulk having pinning centers and capable of trapping a magnetic field, said second bulk showing a maximum superconductive current density at a relatively low magnetic field.
Claim 10
Dependent Claim
20 words
A composite material as claimed in claim 6, wherein said first bulk is Nd--Ba--Cu--O, and said second bulk is Y--Ba--Cu--O.
Claim 11
Dependent Claim
31 words
A method of producing a composite material according to claim 1, comprising the steps of: preparing said plurality of sections separately; and assembling said plurality of sections into said unitary structure.
Claim 12
Dependent Claim
46 words
A method of producing a composite material according to claim 4, comprising the steps of: preparing said core section; immersing said core section in a solution to grow crystal of said Y--Ba--Cu--O superconductive on said core section; and trimming said crystal to form said outer section.
Claim 13
Dependent Claim
55 words
A method of producing a composite material according to claim 6, comprising the steps of: preparing said core section; immersing said core section in a solution to grow a crystal layer of said Y--Ba--Cu--O superconductive on each of the opposite sides of said core section; and trimming said crystal layers to form said outer sections.
Claim 14
Dependent Claim
18 words
A superconductive magnet comprising a composite material according to claim 1 and means for magnetizing said composite material.
Claim 15
Dependent Claim
152 words
A superconductive coil device comprising a plurality of axially stacked annular bodies of a conductive metal, each of said annular bodies having embedded therewithin (a) at least one, first ring of a first bulk of a superconductive metal oxide of RE--Ba--Cu--O wherein RE represents a rare earth element, said first bulk having pinning centers and capable of trapping a magnetic field, said first bulk showing a maximum superconductive current density at a relatively high magnetic field and (b) at least one, second ring of a second bulk of a superconductive metal oxide of RE--Ba--Cu--O wherein RE represents a rare earth element different from that of said first bulk, said second bulk having pinning centers and capable of trapping a magnetic field, said second bulk showing a maximum superconductive current density at a relatively low magnetic field, said first ring being coaxial with said second ring and located inside of said second ring.
Claim 16
Dependent Claim
152 words
A superconductive coil device comprising a plurality of axially stacked annular bodies of a conductive metal, each of said annular bodies having embedded therewithin (a) at least one, first ring of a first bulk of a superconductive metal oxide of RE--Ba--Cu--O wherein RE represents a rare earth element, said first bulk having pinning centers and capable of trapping a magnetic field, said first bulk showing a maximum superconductive current density at a relatively high magnetic field and (b) at least one, second ring of a second bulk of a superconductive metal oxide of RE--Ba--Cu--O wherein RE represents a rare earth element different from that of said first bulk, said second bulk having pinning centers and capable of trapping a magnetic field, said second bulk showing a maximum superconductive current density at a relatively low magnetic field, said first ring being coaxial with said second ring and located inside of said second ring.
Claim 17
Dependent Claim
21 words
A superconductive coil device as claimed in claim 12, wherein said first bulk is Nd--Ba--Cu--O, and said second bulk is Y--Ba--Cu--O.
References Cited (Backward Citations)
US4190817A
Cited
EP0340860A1
Cited
WO1992018992A1
Cited
US5525584A
Cited
US5444425A
Cited
US5650376A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-07-05 | 2003-01-04 | 2003-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-07-05 | 2007-01-04 | 2007-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-07-05 | 2011-01-04 | 2011-07-06 | $7700.00 | Window Closed / Lapsed |