Patent US1558419A successfully refreshed from Google Patents.
US3569823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nuclear magnetic resonance apparatus
Assignee: Applied Biosystems Inc
•
Filing: 1968-10-18
•
Granted: 1971-03-09
•
Expires: 1988-10-18
Abstract
Abstract An improved field homogenizing coil arrangement of a type having a generally tubular coil form extending about a test sample in an NMR apparatus is described. The coil arrangement includes a plurality of separate coils which are orthogonally related and which are formed of conductive segments positioned on opposite surfaces of the coil form and are conductively coupled through the form. The coils include arcuate-shaped segments positioned on one surface of the form and aligned normally with respect to a main polarizing field component, and rectilinear shaped segments positioned on an opposite surface of the form and extending in a direction substantially parallel to the main polarizing field component. The conductive segments are fabricated on the form by printed circuit techniques and the form is adapted to be rolled into a scroll-shaped configuration. With this arrangement, a relatively large number of field corrective coils are positioned on the form while overlapping rectilinear segments cancel undesired fields established by current return paths.
Inventors
- 👤 Marcel J E Golay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:07
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/38; G01R33/387; G01R33/3875; G01R33/381; G01R33/3815; H; H01; H01F; H01F7/00; H01F7/06; H01F7/20; H01F7/202
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
247 words
A field-homogenizing coil arrangement for a nuclear magnetic resonance apparatus having a polarizing field component comprising: a coil form assembly having a body thickness thereof formed from an elongated sheet of insulating material sandwiched between first and second planar electroconductors, said body thickness rolled to provide a generally tubular shaped coil form having a longitudinal axis thereof and an overlapping thickness; said coil form positioned about a test sample and having said longitudinal axis aligned with the polarizing field component; a plurality of arcuate shaped electrically conductive segments formed by said first electroconductor surface, each of said arcuate segments laying in planes which are normal to the polarizing field component of the apparatus; a plurality of rectilinear shaped electrically conductive segments formed by said second electroconductor, said rectilinear segments extending in a direction generally perpendicular to said arcuate segments and parallel to the polarizing field component of the apparatus; means providing electrically conductive coupling through said insulating material between arcuate and rectilinear segments to provide a plurality of separate electrically insulated field generating coils; and said arcuate and rectilinear segments spaced on said form and intercoupled in a manner for providing that each of said field generating coils establish orthogonally related homogenizing fields when a current flows in the coils and at least some of the rectilinear segments of an individual coil are overlaid at said overlapping portion for carrying current in an opposite direction in a manner for effectively cancelling the magnetic fields established by them.
Claim 2
Dependent Claim
247 words
A field-homogenizing coil arrangement for a nuclear magnetic resonance apparatus having a polarizing field component comprising: a coil form assembly having a body thickness thereof formed from an elongated sheet of insulating material sandwiched between first and second planar electroconductors, said body thickness rolled to provide a generally tubular shaped coil form having a longitudinal axis thereof and an overlapping thickness; said coil form positioned about a test sample and having said longitudinal axis aligned with the polarizing field component; a plurality of arcuate shaped electrically conductive segments formed by said first electroconductor surface, each of said arcuate segments laying in planes which are normal to the polarizing field component of the apparatus; a plurality of rectilinear shaped electrically conductive segments formed by said second electroconductor, said rectilinear segments extending in a direction generally perpendicular to said arcuate segments and parallel to the polarizing field component of the apparatus; means providing electrically conductive coupling through said insulating material between arcuate and rectilinear segments to provide a plurality of separate electrically insulated field generating coils; and said arcuate and rectilinear segments spaced on said form and intercoupled in a manner for providing that each of said field generating coils establish orthogonally related homogenizing fields when a current flows in the coils and at least some of the rectilinear segments of an individual coil are overlaid at said overlapping portion for carrying current in an opposite direction in a manner for effectively cancelling the magnetic fields established by them.
Claim 3
Dependent Claim
32 words
The homogenizing coil arrangement of claim 1, wherein each of said coils is formed for establishing a corrective magnetic field representable by a spherical harmonic of particular degree n and order m.
Claim 4
Dependent Claim
27 words
The field homogenizing coil arrangement of claim 2 wherein said magnetic potential from which said fields are derived comprises zonal and tesseral harmonics of successively higher degree.
Claim 5
Dependent Claim
54 words
The field homogenizing coil arrangements of claim 3 wherein said insulative form comprises a central insulative material of a double-clad printed circuit board and said segments are formed from conductive metal surfaces adhering to said insulative material, said double-clad board having a thickness adapting said board to be rolled into a scroll shaped configuration.
References Cited (Backward Citations)
US1829740A
Cited
US3406333A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |