Patent US3081401A successfully refreshed from Google Patents.
US3081401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of cement detection by nuclear logging
Assignee: Dresser Industries Inc
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Filing: 1959-05-05
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Granted: 1963-03-12
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Expires: 1979-05-05
Abstract
No abstract record available.
Inventors
- 👤 John C Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:56
CPC Classifications
G; G01; G01V; G01V5/00; G01V5/04; G01V5/08; G01V5/10; G01V5/104
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
THE METHOD OF NUCLEAR WELL LOGGING COMPRISING THE STEPS OF IRRADIATING THE MATERIAL OUTSIDE THE CASING OF A CASED BOREHOLE WITH GAMMA RAYS AND NEUTRONS FROM A COMMON SOURCE, DETECTING WITH A COMMON DETECTOR GAMMA RAYS SCATTERED BY CEMENT OUTSIDE SAID CASING AND RADIATIONS RESULTING FROM NEUTRON BOMBARDMENT OF THE FORMATIONS OUTSIDE SAID BOREHOLE, ESTABLISHING A FIRST ELECTRICAL
Claim 2
Independent Claim
58 words
THE METHOD OF NUCLEAR WELL LOGGING COMPRISING THE STEPS OF IRRADIATING THE MATERIAL OUTSIDE THE CASING OF A CASED BOREHOLE WITH GAMMA RAYS AND NEUTRONS FROM A COMMON SOURCE, DETECTING WITH A COMMON DETECTOR GAMMA RAYS SCATTERED BY CEMENT OUTSIDE SAID CASING AND RADIATIONS RESULTING FROM NEUTRON BOMBARDMENT OF THE FORMATIONS OUTSIDE SAID BOREHOLE, ESTABLISHING A FIRST ELECTRICAL
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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) | 1966-03-11 | 1966-09-10 | 1967-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-11 | 1970-09-10 | 1971-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-11 | 1974-09-10 | 1975-03-12 | $7700.00 | Window Closed / Lapsed |