US5111145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for studying the properties of a material
Assignee: Instrumentarium Oyj
•
Filing: 1991-02-28
•
Granted: 1992-05-05
•
Expires: 2011-02-28
Abstract
Abstract The invention relates to a method and apparatus for applying dynamic nuclear polarization and magnetic imaging to studying an object. As the saturation of an electron spin system required by dynamic nuclear polarization is proceeding, the intensity of a polarizing magnetic field over the object is different from that of a polarizing magnetic field lying over the object during the detection of an NMR signal. The apparatus is provided with means for changing the intensity of a polarizing magnetic field in a manner such that the difference between magnetic field intensities is achieved.
Inventors
- 👤 Raimo E. Sepponen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:43
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/62
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
64 words
A method for the application of dynamic nuclear polarization and magnetic resonance imaging to studying an object, characterized in that, as the saturation of an electron spin system required by dynamic nuclear polarization is occurring, the intensity of a polarizing magnetic field over the object is different from that of a polarizing field lying over the target during the detection of an NMR signal.
Claim 2
Independent Claim
64 words
A method for the application of dynamic nuclear polarization and magnetic resonance imaging to studying an object, characterized in that, as the saturation of an electron spin system required by dynamic nuclear polarization is occurring, the intensity of a polarizing magnetic field over the object is different from that of a polarizing field lying over the target during the detection of an NMR signal.
Claim 3
Dependent Claim
39 words
A method as set forth in claim 1, characterized in that the spin systems of the nuclei having a magnetic moment in the object are saturated by exposing the object to the resonance frequency electromagnetic radiations of the nuclei.
Claim 4
Dependent Claim
28 words
A method as set forth in claim 1, characterized in that the electromagnetic radiation induced by electron spin saturation is stopped during the detection of an NMR signal.
Claim 5
Dependent Claim
30 words
A method as set forth in claim 1, characterized in that some electromagnetic radiations saturating the spin systems of an object are stopped during the detection of an NMR signal.
Claim 6
Independent Claim
79 words
An apparatus for applying dynamic nuclear polarization and magnetic resonance imaging methods to studying an object, characterized in that said apparatus is provided with means for changing the intensity of a polarizing magnetic field in a manner that the intensity of a polarizing field over the object during the saturation of an electron spin system required by dynamic nuclear polarization is different from that of a polarizing field lying over the object during the detection of an NMR signal.
Claim 7
Independent Claim
79 words
An apparatus for applying dynamic nuclear polarization and magnetic resonance imaging methods to studying an object, characterized in that said apparatus is provided with means for changing the intensity of a polarizing magnetic field in a manner that the intensity of a polarizing field over the object during the saturation of an electron spin system required by dynamic nuclear polarization is different from that of a polarizing field lying over the object during the detection of an NMR signal.
Claim 8
Dependent Claim
39 words
An apparatus as set forth in claim 5, characterized in that it is provided with means for saturating the spin systems of the nuclei having a magnetic moment in the object with resonance frequency electromagnetic radiations of the nuclei.
Claim 9
Dependent Claim
74 words
An apparatus as set forth in claim 5, said apparatus having means generating electromagnetic radiations for saturating electron and nuclear spin systems in the object, characterized in that it is provided with means for controlling said means generating the electromagnetic radiations which saturate the electron and nuclear spin systems, control being effected in a manner such that at least some of said generating means are switched off during the recording of an NMR signal.
References Cited (Backward Citations)
US3475680A
Cited
US3873909A
Cited
US3501691A
Cited
US4034191A
Cited
US4070611A
Cited
US4110681A
Cited
SU750354A1
Cited
US4280096A
Cited
US4345207A
Cited
SU918829A1
Cited
US4563647A
Cited
US4587493A
Cited
US4668904A
Cited
US4644281A
Cited
US4654595A
Cited
US4712068A
Cited
US4743850A
Cited
US4719425A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-05 | 1995-11-04 | 1996-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-05 | 1999-11-04 | 2000-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-05 | 2003-11-04 | 2004-05-05 | $7700.00 | Window Closed / Lapsed |