US3115579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radioactivity well logging for carbon determination
Assignee: Texaco Inc
•
Filing: 1957-01-07
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Granted: 1963-12-24
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Expires: 1977-01-07
Abstract
No abstract record available.
Inventors
- 👤 Jr Hugh E Hall
- 👤 Alexander S Mckay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:15
CPC Classifications
G; G01; G01V; G01V5/00; G01V5/04; G01V5/08; G01V5/10; G01V5/101; G01V5/102; G01V5/104; G01V5/105
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
THE METHOD OF ANALYZING AN EARTH FORMATION ALONG THE TRAVERSE OF A BORE HOLE FOR THE PRESENCE OF CARBON BY MEANS OF AN INSTRUMENT THAT IS ADAPTED AND ARRANGED TO BE PASSED THROUGH THE BORE HOLE AND THAT IS SUITABLE TO PRODUCE FAST NEUTRONS INEXCESS OF A PREDETERMINED ENERGY LEVEL AND TO DETECT GAMMA RAYS OF CORRESPONDING PREDETERMINED ENERGY LEVEL, WHICH COMPRISES IRRADIATING THE FORMATION ALONG THE PATH OF THE BORE HOLE WITH NEUTRONS HAVING AN ENERGY RANGE IN EXCESS OF 4,80 MILLION ELECTRON VOLTS AS DETERMINED BY THE INELEASTIC REACTION THRESHOLD CHARACTERISTIC OF CARBON WHICH RANGE HAS AN UPPER LIMIT OF 6.5 MILLION ELECTRON VOLTS, AND SELECTIVELY DETECTING INELASTICALLY PRODUCED GAMMA RAYS OF THE ORDER OF 4.43 MILLION ELECTRON VOLTS PRODUCED IN THE FORMATION BY SAID NEUTRONS AS AN INDICATION OF THE PRESENCE OF CARBON NUCLEI IN THE FORMATION.
Claim 2
Independent Claim
140 words
THE METHOD OF ANALYZING AN EARTH FORMATION ALONG THE TRAVERSE OF A BORE HOLE FOR THE PRESENCE OF CARBON BY MEANS OF AN INSTRUMENT THAT IS ADAPTED AND ARRANGED TO BE PASSED THROUGH THE BORE HOLE AND THAT IS SUITABLE TO PRODUCE FAST NEUTRONS INEXCESS OF A PREDETERMINED ENERGY LEVEL AND TO DETECT GAMMA RAYS OF CORRESPONDING PREDETERMINED ENERGY LEVEL, WHICH COMPRISES IRRADIATING THE FORMATION ALONG THE PATH OF THE BORE HOLE WITH NEUTRONS HAVING AN ENERGY RANGE IN EXCESS OF 4,80 MILLION ELECTRON VOLTS AS DETERMINED BY THE INELEASTIC REACTION THRESHOLD CHARACTERISTIC OF CARBON WHICH RANGE HAS AN UPPER LIMIT OF 6.5 MILLION ELECTRON VOLTS, AND SELECTIVELY DETECTING INELASTICALLY PRODUCED GAMMA RAYS OF THE ORDER OF 4.43 MILLION ELECTRON VOLTS PRODUCED IN THE FORMATION BY SAID NEUTRONS AS AN INDICATION OF THE PRESENCE OF CARBON NUCLEI IN THE FORMATION.
References Cited (Backward Citations)
US2712081A
Cited
US2721944A
Cited
GB724441A
Cited
US2769096A
Cited
US2744199A
Cited
US2991364A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-12-23 | 1967-06-24 | 1967-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-12-23 | 1971-06-24 | 1971-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-12-23 | 1975-06-24 | 1975-12-24 | $7700.00 | Window Closed / Lapsed |