US3083335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic resonance methods and apparatus
Assignee: Schlumberger Well Surveying Corp
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Filing: 1955-10-05
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Granted: 1963-03-26
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Expires: 1975-10-05
Abstract
No abstract record available.
Inventors
- 👤 Nick A Schuster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:39
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
APPARATUS FOR OBSERVING MAGNETIC RELAXATION PHENOMENA IN PARTICLES EXHIBITING PARAMAGNETIC PROPERTIES COMPRISING MEANS FOR APPLYING A POLARIZING MAGNETIC FIELD TO SAID PARTICLES, MEANS FOR PERIODICALLY REVERSING THE DIRECTION OF SAID POLARIZING MAGNETIC FIELD DURING INTERVALS SHORT WITH RESPECT TO THE RELAXATION TIME T1 ASSOCIATED WITH SAID PARTICLES, AND MEANS FOR DETECTING VARIATIONS IN THE RESULTANT MAGNETIC FIELD IN THE VICINTY OF SAID PARTICLES WHICH ARE A FUNCTION OF MAGNETIC RELAXATION OF SAID PARTICLES DURING THE PERIODS BETWEEN SAID INTERVALS,
Claim 2
Dependent Claim
109 words
IN A METHOD OF DETERMINING THE MAGNETIC RESONANCE PROPERTIES OF THAT PORTION OF MATERIAL LOCATED AT A PREDETERMINED DEPTH BENEATH THE SURFACE OF SAID MATERIAL, THE STEPS OF APPLYING A SUBSTANTIALLY CONSTANT DIVERGENT MAGNETIC FIELD BETWEEN SPACED-APART LOCATIONS ON SAID SURFACE WHEREBY SAID FIELD DECREASES IN INTENSITY WITH THE DISTANCE BEHIND SAID SURFACE, APPLYING AN ALTERNATING MAGNETIC FIELD PERPENDICULARLY TO SAID CONSTANT FIELD IN SAID MATERIAL AND AT A FREQUENCY EQUAL TO THE RESONANCE PRECESSION FREQUENCY OF SELECTED PARAMAGNETIC PARTICLES IN A CONSTANT FIELD OF THE PARTICULAR INTENSITY OF SAID CONSTANT FIELD AT THE PREDETERMINED DEPTH OF SAID PORTION, AND OBTAINING INDICATIONS OF THE MAGNETIC RESONANCE IN SAID PARTICLES.
References Cited (Backward Citations)
US2561489A
Cited
US2705790A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-03-25 | 1966-09-24 | 1967-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-25 | 1970-09-24 | 1971-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-25 | 1974-09-24 | 1975-03-26 | $7700.00 | Window Closed / Lapsed |