US2852696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for investigating earth formations
Assignee: Schlumberger Well Surveying Corp
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Filing: 1954-12-20
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Granted: 1958-09-16
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Expires: 1974-12-20
Abstract
No abstract record available.
Inventors
- 👤 Frank F Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:02
CPC Classifications
G; G01; G01V; G01V5/00; G01V5/04; G01V5/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
76 words
APPARATUS FOR INVESTIGATING EARTH FORMATIONS TRAVERSED BY A BOREHOLE COMPRISING: A GENERATOR OF NEUTRONS PROVIDING A NEUTRON FLEX OF ADJUSTIBLE MAGNITUDE ADAPTED TO TRAVERSE A BOREHOLE, MEANS FOR DERIVING A CONTROL EFFECT RESPONSIVE TO VARIATIONS IN THE DIAMETET OF THE BOREHOLE, MEANS ADJUSTING THE MAGMNITUDE OF SAID NEUTRON FLUX IN ACCORDANCE WITH SAID CONTROL EFFECT, AND MEANS FOR OBTAINING INDICATIONS OF A PHENOMENON RESULTING FROM IRRADIATION OF FORMATIONS ADJACENT THE BOREHOLE BY NEUTRONS FROM SAID GENERATOR.
References Cited (Backward Citations)
US2648778A
Cited
US2689918A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |