US5011818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sensing a magnetic field with a super conductive material that exhibits magneto resistive properties
Assignee: Sharp Corp
•
Filing: 1988-07-29
•
Granted: 1991-04-30
•
Expires: 2008-07-29
Abstract
Abstract A superconductive magneto-resistive device is made up of superconductive materials having grain boundaries which act as weak couplings. The superconductive material will change from the superconductive state to the normal state when a magnetic field is applied to the material. The superconductive material can be used in various devices for measuring.
Inventors
- 👤 Shoei Katoka
- 👤 Shuhei Tsuchimoto
- 👤 Hideo Nojima
- 👤 Ryusuke Kita
- 👤 Masaya Nagata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:58
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/02; G01R33/035; G01R33/0352; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; H; H10; H10N; H10N50/00; H10N50/80; H10N50/85; Y; Y10; Y10S; Y10S505/00; Y10S505/70; Y10S505/701; Y10S505/702
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
86 words
A method for sensing a magnetic field which comprises: (a) applying a magnetic field to a superconductive material having grain boundaries, the application of said magnetic field being accompanied with a phase transition of said superconductive material from a superconductive phase to a normal conductive phase; and (b) sensing said magnetic field by detecting a change in the resistance of said superconductive material which change in resistance is accompanied with the phase transition of said superconductive material from the superconductive phase to the normal conductive phase.
Claim 2
Independent Claim
86 words
A method for sensing a magnetic field which comprises: (a) applying a magnetic field to a superconductive material having grain boundaries, the application of said magnetic field being accompanied with a phase transition of said superconductive material from a superconductive phase to a normal conductive phase; and (b) sensing said magnetic field by detecting a change in the resistance of said superconductive material which change in resistance is accompanied with the phase transition of said superconductive material from the superconductive phase to the normal conductive phase.
Claim 3
Independent Claim
103 words
A method for sensing a magnetic field which comprises: (a) applying a magnetic field to a superconductive material having grain boundaries by applying current to said superconductive material having grain boundaries; (b) applying an external magnetic field to said superconductive material having grain boundaries, accompanied with a phase transition of said superconductive material from a superconductive phase to a normal conductive phase; and (c) sensing said external magnetic field by detecting a change in the resistance of said superconductive material having grain boundaries which is accompanied with the phase transition of said superconductive material from the superconductive phase to the normal conductive phase.
Claim 4
Independent Claim
103 words
A method for sensing a magnetic field which comprises: (a) applying a magnetic field to a superconductive material having grain boundaries by applying current to said superconductive material having grain boundaries; (b) applying an external magnetic field to said superconductive material having grain boundaries, accompanied with a phase transition of said superconductive material from a superconductive phase to a normal conductive phase; and (c) sensing said external magnetic field by detecting a change in the resistance of said superconductive material having grain boundaries which is accompanied with the phase transition of said superconductive material from the superconductive phase to the normal conductive phase.
Claim 5
Independent Claim
89 words
A method for sensing a magnetic field which comprises: (a) supplying a current through a superconductive material having grain boundaries; (b) applying a magnetic field to said superconductive material, said magnetic field causing a phase transition of said superconductive material from a superconductive phase to a normal conductive phase; and (c) detecting a change in the resistance of said superconductive material as an indication of said magnetic field, said change being accompanied with the phase transition of said superconductive material from the superconductive phase to the normal conductive phase.
Claim 6
Independent Claim
89 words
A method for sensing a magnetic field which comprises: (a) supplying a current through a superconductive material having grain boundaries; (b) applying a magnetic field to said superconductive material, said magnetic field causing a phase transition of said superconductive material from a superconductive phase to a normal conductive phase; and (c) detecting a change in the resistance of said superconductive material as an indication of said magnetic field, said change being accompanied with the phase transition of said superconductive material from the superconductive phase to the normal conductive phase.
Claim 7
Dependent Claim
44 words
A superconductive magneto-resistive device comprising: a superconductive material having grain boundaries which act as weak couplings; and means for operatively connecting said superconductive material to use the change in resistance of said superconductive material when a magnetic field is applied to said superconductive material.
Claim 8
Dependent Claim
44 words
A superconductive magneto-resistive device comprising: a superconductive material having grain boundaries which act as weak couplings; and means for operatively connecting said superconductive material to use the change in resistance of said superconductive material when a magnetic field is applied to said superconductive material.
Claim 9
Dependent Claim
18 words
A superconductive magneto-resistive device as claimed in claim 4, wherein said superconductive material is IIIa-IIa-Cu-O ceramic superconductive material.
Claim 10
Dependent Claim
36 words
A superconductive magneto-resistive device as claimed in claim 4, wherein said means for operatively connecting said superconductive uses the change in resistance in said superconductive for sensing an external magnetic field applied to said superconductive material.
Claim 11
Dependent Claim
35 words
A superconductive magneto-resistive device as claimed in claim 4, wherein said means for operatively connecting measures the resistance of said superconductive material as an indication of an external magnetic field applied to said superconductive material.
Claim 12
Dependent Claim
18 words
A superconductive magneto-resistive device as claimed in claim 4, wherein said means for operatively connecting is a waveguide.
Claim 13
Dependent Claim
19 words
A superconductive magneto-resistive device as claimed in claim 8, wherein said superconductive material is physically attached to said waveguide.
Claim 14
Dependent Claim
14 words
A superconductive device as claimed in claim 8, wherein said waveguide is a microwaveguide.
Claim 15
Dependent Claim
28 words
A superconductive magneto-resistive device as claimed in claim 4, wherein said means for operatively connecting is a magnetic head for sensing magnetic fields recorded in a recording medium.
Claim 16
Dependent Claim
26 words
A superconductive magneto-resistive device as claimed in claim 4, wherein said means for operatively connecting is a position sensor for detecting a position of an object.
Claim 17
Dependent Claim
18 words
A superconductive magneto-resistive device as claimed in claim 12, wherein said position sensor is a one-dimensional position sensor.
Claim 18
Dependent Claim
18 words
A superconductive magneto-resistive device as claimed in claim 12, wherein said position sensor is a two-dimensional position sensor.
Claim 19
Dependent Claim
18 words
A superconductive magneto-resistive device as claimed in claim 4, wherein said means for operatively connecting is a potentiometer.
Claim 20
Dependent Claim
18 words
A superconductive magneto-resistive device as claimed in claim 4, wherein said means for operatively connecting is a transformer.
Claim 21
Dependent Claim
18 words
A superconductive magneto-resistive device as claimed in claim 4, wherein said means for operatively connecting is a gear.
Claim 22
Independent Claim
73 words
A system for using a superconductive magneto-resistive device comprising: a superconductive material having grain boundaries; means for applying a magnetic field to said superconductive material; and means for measuring the resistance of said superconductive material as an indication of an external magnetic field applied to said superconductive material, said resistance being accompanied with a phase transition of said superconductive material from the superconductive material from the superconductive phase to the normal conductive phase.
Claim 23
Independent Claim
73 words
A system for using a superconductive magneto-resistive device comprising: a superconductive material having grain boundaries; means for applying a magnetic field to said superconductive material; and means for measuring the resistance of said superconductive material as an indication of an external magnetic field applied to said superconductive material, said resistance being accompanied with a phase transition of said superconductive material from the superconductive material from the superconductive phase to the normal conductive phase.
Claim 24
Dependent Claim
30 words
A system for using a superconductive magneto-resistive device as claimed in claim 18, wherein said means for applying a magnetic field applies a constant magnetic field to said superconductive material.
Claim 25
Dependent Claim
30 words
A system for using a superconductive magneto-resistive device as claimed in claim 18, wherein said means for applying a magnetic field applies a variable magnetic field to said superconductive material.
Claim 26
Dependent Claim
31 words
A system for using a superconductive magneto-resistive device as claimed in claim 18, wherein said means for applying a magnetic field includes means for supplying electrical current to said superconductive material.
Claim 27
Dependent Claim
38 words
A system for using a superconductive magneto-resistive device as claimed in claim 18, wherein said means for measuring the resistance is means for detecting a voltage generated in said superconductive material when said magnetic field is applied thereto.
Claim 28
Independent Claim
75 words
A system for using a superconductive magneto-resistive device comprising: a superconductive material having grain boundaries; means for supplying an electric current through said superconductive material; means for measuring the resistance of said superconductive material as an indication of an external magnetic field applied to said superconductive material, wherein a change in resistance of said superconductive material is accompanied with a phase transition of said superconductive material from the superconductive phase to the normal conductive phase.
Claim 29
Independent Claim
75 words
A system for using a superconductive magneto-resistive device comprising: a superconductive material having grain boundaries; means for supplying an electric current through said superconductive material; means for measuring the resistance of said superconductive material as an indication of an external magnetic field applied to said superconductive material, wherein a change in resistance of said superconductive material is accompanied with a phase transition of said superconductive material from the superconductive phase to the normal conductive phase.
Claim 30
Dependent Claim
29 words
A system for using a superconductive magneto-resistive device as claimed in claim 23, wherein said mean for supplying an electric current is means for supplying a constant electric current.
Claim 31
Dependent Claim
29 words
A system for using a superconductive magneto-resistive device as claimed in claim 23, wherein said means for supplying an electric current is means for supplying a variable electric current.
Claim 32
Dependent Claim
26 words
A system for using a superconductive magneto-resistive device as claimed in claim 25, wherein said variable electric current is a current varied from the value zero.
Claim 33
Dependent Claim
22 words
A system for using a superconductive magneto-resistive device as claimed in claim 25, wherein said variable electric current is a pulse current.
Claim 34
Dependent Claim
23 words
A system for using a superconductive magneto-resistive device as claimed in claim 27, wherein said pulse current is a saw tooth pulse current.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-29 | 1994-10-29 | 1995-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-29 | 1998-10-29 | 1999-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-29 | 2002-10-29 | 2003-04-30 | $7700.00 | Window Closed / Lapsed |