Patent US1539577A successfully refreshed from Google Patents.
US2778950A
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Methods and apparatus for localized neutron logging
Assignee: Schlumberger Well Surveying Corp
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Filing: 1952-12-30
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Granted: 1957-01-22
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Expires: 1972-12-30
Abstract
No abstract record available.
Inventors
- 👤 Jr Hugh B Frey
- 👤 Tittman Jay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:03
CPC Classifications
G; G01; G01V; G01V5/00; G01V5/04; G01V5/08; G01V5/10; G01V5/107
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
106 words
APPARATUS FOR DETECTING SURFACE IRREGULARITIES IN THE SIDE WALL OF A BOREHOLE CONTAINING HYDROGENOUS LIQUID COMPRISING A SOURCE EMITTING SUBSTANTIALLY ONLY SLOW NEUTRONS, MEANS FOR RESILIENTLY FORCING SAID SOURCE AGAINST THE SIDE WALL OF THE BOREHOLE OT SQUEEZE THE BULK OF THE HYROGENOUS LIQUID AWAY FROM THE SAPCE BETWEEN SAID SOURCE OF SLOW NEUTRONS AND THE SIDE WALL, A DETECTOR OF THERMAL NEUTRONS ADJACENT SAID NEUTRON SOURCE, AND MEANS FOR SHIELDING SAID DETECTOR FROM THE BOREHOLE LIQUID WHEREBY SAID DETECTOR IS RESPONSIVE PRIMARILY TO NEUTRONS THERMALIZED BY THE RESIDUAL LIQUID IN THE SPACE BETWEEN SAID SOURCE AND DETECTOR AND THE ADJACENT SIDE WALL OF THE BOREHOLE.
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) | 1960-01-22 | 1960-07-23 | 1961-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-22 | 1964-07-23 | 1965-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-22 | 1968-07-23 | 1969-01-22 | $7700.00 | Window Closed / Lapsed |