Patent EP0108390A1 successfully refreshed from Google Patents.
US3275931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of nuclear magnetic resonance well logging
Assignee: Phillips Petroleum Co
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Filing: 1962-09-10
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Granted: 1966-09-27
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Expires: 1982-09-10
Abstract
No abstract record available.
Inventors
- 👤 Russell L Collins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:23
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
THE METHOD OF WELL LOGGING WHICH COMPRISES ESTABLISHING A UNIDIRECTIONAL MAGNETIC FIELD IN AN EARTH FORMATION SURROUNDING A WELL BORE; PERMITTING SAID MAGNETIC FIELD TO DECAY; THEREAFTER APPLYING A SECOND MAGNETIC FIELD TO THE EARTH FORMATION, SAID SECOND MAGNETIC FIELD BEING AT SUBSTANTIALLY RIGHT ANGLES WITH THE MAGNETIC FIELD OF THE EARTH AND ALTERNATING IN DIRECTION AT THE LARMOR FREQUENCY OF NUCLEI OF LIQUIDS IN THE FORMATION UNDER THE MAGNETIC FIELD OF THE EARTH, THE MAGNITUDE OF SAID SECOND MAGNETIC FIELD BEING SUCH AS TO SHIFT THE MOMENTS OF THE PRECESSING
Claim 2
Independent Claim
91 words
THE METHOD OF WELL LOGGING WHICH COMPRISES ESTABLISHING A UNIDIRECTIONAL MAGNETIC FIELD IN AN EARTH FORMATION SURROUNDING A WELL BORE; PERMITTING SAID MAGNETIC FIELD TO DECAY; THEREAFTER APPLYING A SECOND MAGNETIC FIELD TO THE EARTH FORMATION, SAID SECOND MAGNETIC FIELD BEING AT SUBSTANTIALLY RIGHT ANGLES WITH THE MAGNETIC FIELD OF THE EARTH AND ALTERNATING IN DIRECTION AT THE LARMOR FREQUENCY OF NUCLEI OF LIQUIDS IN THE FORMATION UNDER THE MAGNETIC FIELD OF THE EARTH, THE MAGNITUDE OF SAID SECOND MAGNETIC FIELD BEING SUCH AS TO SHIFT THE MOMENTS OF THE PRECESSING
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) | 1969-09-26 | 1970-03-28 | 1970-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-26 | 1974-03-28 | 1974-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-26 | 1978-03-28 | 1978-09-27 | $7700.00 | Window Closed / Lapsed |