US3199022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Penetration control for nuclear magnetism well logging
Assignee: Borg Warner Corp
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Filing: 1961-06-29
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Granted: 1965-08-03
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Expires: 1981-06-29
Abstract
No abstract record available.
Inventors
- 👤 Robert J S Brown
- 👤 John E Coolidge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:41
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
APPARATUS FOR CONTROLLING THE REGION OF SENSITIVITY FOR DETECTION OF SPIN MAGNETIC INDUCTION WELL LOGGING SIGNALS FROM PRECESSING NUCLEI IN A WALL BORE AND THE SURROUNDING EARTH FORMATION, COMPRISING: (A) A POLARIZATION COIL, (B) CURRENT SUPPLYING MEANS TO PRODUCE A CURRENT FOR ENERGIZING SAID POLARIZING COIL TO PRODUCE A POLARIZATION FIELD IN SAID NUCLEI, (C) MEANS FOR CHANGING SAID CURRENT FROM SAID CURRENT SUPPLYING MEANS TO REDUCE SAID POLARIZATION FIELD TO A STRENGTH LESS THAN THE EARTH''S MAGNETIC FIELD IN CERTAIN REGIONS OF SAID EARTH FORMATIONS BEYOND A PREDETERMINED RADIAL DISTANCE FROM THE CENTER OF SAID COIL, (D) MEANS FOR INTERRUPTING CURRENT FROM SAID CURRENT SUPPLYING MEANS TO TERMINATE SAID POLARIZATION FIELD IN REGIONS OF SAID WELL BORE AND EARTH FORMATION RADIALLY SPACED FROM THE CENTER OF SAID COIL WHERE THE STRENGTH OF SAID FIELD IS AT LEAST AS GREAT AS THE EARTH''S MAGNETIC FIELD IN A TIME PERIOD SHORT WITH RESPECT TO THE RECIPROCAL ANGULAR FREQUENCY OF SAID PRECESSING NUCLEI,
Claim 2
Dependent Claim
161 words
APPARATUS FOR CONTROLLING THE REGION OF SENSITIVITY FOR DETECTION OF SPIN MAGNETIC INDUCTION WELL LOGGING SIGNALS FROM PRECESSING NUCLEI IN A WALL BORE AND THE SURROUNDING EARTH FORMATION, COMPRISING: (A) A POLARIZATION COIL, (B) CURRENT SUPPLYING MEANS TO PRODUCE A CURRENT FOR ENERGIZING SAID POLARIZING COIL TO PRODUCE A POLARIZATION FIELD IN SAID NUCLEI, (C) MEANS FOR CHANGING SAID CURRENT FROM SAID CURRENT SUPPLYING MEANS TO REDUCE SAID POLARIZATION FIELD TO A STRENGTH LESS THAN THE EARTH''S MAGNETIC FIELD IN CERTAIN REGIONS OF SAID EARTH FORMATIONS BEYOND A PREDETERMINED RADIAL DISTANCE FROM THE CENTER OF SAID COIL, (D) MEANS FOR INTERRUPTING CURRENT FROM SAID CURRENT SUPPLYING MEANS TO TERMINATE SAID POLARIZATION FIELD IN REGIONS OF SAID WELL BORE AND EARTH FORMATION RADIALLY SPACED FROM THE CENTER OF SAID COIL WHERE THE STRENGTH OF SAID FIELD IS AT LEAST AS GREAT AS THE EARTH''S MAGNETIC FIELD IN A TIME PERIOD SHORT WITH RESPECT TO THE RECIPROCAL ANGULAR FREQUENCY OF SAID PRECESSING NUCLEI,
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) | 1968-08-02 | 1969-02-01 | 1969-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-02 | 1973-02-01 | 1973-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-02 | 1977-02-01 | 1977-08-03 | $7700.00 | Window Closed / Lapsed |