Patent US2958780A successfully refreshed from Google Patents.
US2958780A
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Methods and apparatus for investigating earth formations
Assignee: Schlumberger Well Surveying Corp
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Filing: 1956-10-29
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Granted: 1960-11-01
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Expires: 1976-10-29
Abstract
No abstract record available.
Inventors
- 👤 John T Dewan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:17
CPC Classifications
G; G01; G01V; G01V5/00; G01V5/04; G01V5/08; G01V5/10; G01V5/101
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A METHOD OF INVESTIGATING EARTH FORMATIONS TRAVERSED BY A BOREHOLE WHICH COMPRISES THE STEPS OF: ESTABLISHING IN THE BOREHOLE IN CLOSE PROXIMITY TO A SIDE WALL PORTION THEREOF NUCLEAR REACTIONS TO PROVIDE RADIANT ENERGY OF ONE TYPE, FOR IRRADIATING THE EARTH FORMATIONS TO PRODUCE RESULTANT RADIANT ENERGY, EACH QUANTUM OF RADIANT ENERGY OF SAID ONE TYPE BEING ACCOMPANIED BY THE EMISSION OF AN OPPOSITELY-DIRECTED QUANTUM OF RADIANT ENERGY OF ANOTHER TYPE, DERIVING A FIRST ELECTRFICAL SIGNAL IN RESPONSE TO SAID RESULTANT RADIANT ENERGY, DERIVING A SECOND ELECTRICAL SIGNAL IN RESPONSE TO RADIANT ENERGY OF SAID OTHER TYPE EMANATING FROM SAID SOURCE IN A DIRECTION OPPOSITE THE AFORESAID SIDE WALL PORTION OF THE BOREHOLE AND OBTAINING INDICATIONS SUBSTANTIALLY ONLY IN RESPONSE TO PORTIONS OF SAID FIRST ELECTRICAL SIGNAL REPRESENTING QUANTA
Claim 2
Independent Claim
129 words
A METHOD OF INVESTIGATING EARTH FORMATIONS TRAVERSED BY A BOREHOLE WHICH COMPRISES THE STEPS OF: ESTABLISHING IN THE BOREHOLE IN CLOSE PROXIMITY TO A SIDE WALL PORTION THEREOF NUCLEAR REACTIONS TO PROVIDE RADIANT ENERGY OF ONE TYPE, FOR IRRADIATING THE EARTH FORMATIONS TO PRODUCE RESULTANT RADIANT ENERGY, EACH QUANTUM OF RADIANT ENERGY OF SAID ONE TYPE BEING ACCOMPANIED BY THE EMISSION OF AN OPPOSITELY-DIRECTED QUANTUM OF RADIANT ENERGY OF ANOTHER TYPE, DERIVING A FIRST ELECTRFICAL SIGNAL IN RESPONSE TO SAID RESULTANT RADIANT ENERGY, DERIVING A SECOND ELECTRICAL SIGNAL IN RESPONSE TO RADIANT ENERGY OF SAID OTHER TYPE EMANATING FROM SAID SOURCE IN A DIRECTION OPPOSITE THE AFORESAID SIDE WALL PORTION OF THE BOREHOLE AND OBTAINING INDICATIONS SUBSTANTIALLY ONLY IN RESPONSE TO PORTIONS OF SAID FIRST ELECTRICAL SIGNAL REPRESENTING QUANTA
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-01 | 1964-05-02 | 1964-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-01 | 1968-05-02 | 1968-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-01 | 1972-05-02 | 1972-11-01 | $7700.00 | Window Closed / Lapsed |