US2888568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nuclear spectoroscopy well logging
Assignee: California Research LLC
•
Filing: 1953-12-02
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Granted: 1959-05-26
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Expires: 1973-12-02
Abstract
No abstract record available.
Inventors
- 👤 Stanley B Jones
- 👤 Walter E Meyerhoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:41
CPC Classifications
G; G01; G01V; G01V5/00; G01V5/04; G01V5/08; G01V5/10; G01V5/101
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
113 words
APPARATUS FOR IDENTIFYING UNKNOWN CONSTITUENT ELEMENTS OF AN EARTH FORMATION TRAVERSED BY A WELL BORE COMPRISING MEANS FOR POSITIONING A NEUTRON SORUCE IN SAID WELL BORE, MEANS FOR POSITIONING GAMMA RAY DETECTOR WITHIN SAID WELL BORE AND VERTICALLY SPACED FROM SAID NEUTRON SOURCE, MEANS FOR SHIELDING SAID DETECTOR FROM GAMMA RAYS EMITTED BY SAID SOURCE AND FROM LOW ENERGY RADIATION INCLUDING MEANS SURROUNDING SAID SOURCE HAVING A SMALL NEUTRON-CAPTURE CROSS-SECTION AND A HIGH GAMMA RAY ABSORPTION CHARACTERISTIC FOR GRAMMA RAYS, SAID GAMMA RAY DETECTOR COMPRISING A SCINTILLATION CRYSTAL OF THALLIUM-ACTIVATED SODIUM ODIDE HAVING VOLUMETRIC DIMENSIONS OF NOT OVER ABOUT ONE CUBIC INCH OT ASSIST THE ESCAPE OF ANNIHILATION QUANTA FROM SAID CRYSTAL WHEN
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) | 1962-05-25 | 1962-11-24 | 1963-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-25 | 1966-11-24 | 1967-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-25 | 1970-11-24 | 1971-05-26 | $7700.00 | Window Closed / Lapsed |