US2967244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well logging apparatus
Assignee: Schlumberger Well Surveying Corp
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Filing: 1956-01-16
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Granted: 1961-01-03
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Expires: 1976-01-16
Abstract
No abstract record available.
Inventors
- 👤 John T Dewan
- 👤 William D Lunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:05
CPC Classifications
G; G01; G01V; G01V5/00; G01V5/04; G01V5/08; G01V5/10; G01V5/101
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
APPARATUS FOR INVESTIGATING EARTH FORMATIONS TRAVERSED BY A BOREHOLE COMPRISING: A SUPPORT ADAPTED TO BE PASSED THROUGH THE BOREHOLE AND HAVING A LONGITUDINAL AXIS, A SOURCE OF RADIANT ENERGY CARRIED BY SAID SUPPORT FOR IRRADIATING THE FORMATIONS, A RADIATION RESPONSIVE DEVICE CARRIED BY SAID SUPPORT FOR CONVERTING RESULTING RADIANT ENERGY TO ELECTRICAL SIGNALS, SAID RADIATION RESPONSIVE DEVICE INCLUDING FLUID TIGHT ENVELOPE MEANS DEFINING TWO COUNTING VOLUMES OF AN IONIZABLE MEDIUM SPACED FROM SAID SOURCE ALONG SAID AXIS AT DIFFERENT DISTANCES, A FIRST ELECTRODE EXTENDING THROUGH ONE OF SAID COUNTING VOLUMES, A SECOND ELECTRODE EXTENDING THROUGH THE OTHER OF SAID COUNTING VOLUMES, AN ELECTRICAL CONDUCTOR CONNECTED TO SAID FIRST ELECTRODE AND EXTENDING THROUGH SAID OTHER COUNTING VOLUME IN ELECTRICALLY SHIELDED RELATION WITH RESPECT TO SAID SECOND ELECTRODE, SAID ELECTRICAL CONDUCTOR BEING EXPOSED TO SAID IONIZABLE MEDIUM, BUT INCAPABLE
Claim 2
Dependent Claim
137 words
APPARATUS FOR INVESTIGATING EARTH FORMATIONS TRAVERSED BY A BOREHOLE COMPRISING: A SUPPORT ADAPTED TO BE PASSED THROUGH THE BOREHOLE AND HAVING A LONGITUDINAL AXIS, A SOURCE OF RADIANT ENERGY CARRIED BY SAID SUPPORT FOR IRRADIATING THE FORMATIONS, A RADIATION RESPONSIVE DEVICE CARRIED BY SAID SUPPORT FOR CONVERTING RESULTING RADIANT ENERGY TO ELECTRICAL SIGNALS, SAID RADIATION RESPONSIVE DEVICE INCLUDING FLUID TIGHT ENVELOPE MEANS DEFINING TWO COUNTING VOLUMES OF AN IONIZABLE MEDIUM SPACED FROM SAID SOURCE ALONG SAID AXIS AT DIFFERENT DISTANCES, A FIRST ELECTRODE EXTENDING THROUGH ONE OF SAID COUNTING VOLUMES, A SECOND ELECTRODE EXTENDING THROUGH THE OTHER OF SAID COUNTING VOLUMES, AN ELECTRICAL CONDUCTOR CONNECTED TO SAID FIRST ELECTRODE AND EXTENDING THROUGH SAID OTHER COUNTING VOLUME IN ELECTRICALLY SHIELDED RELATION WITH RESPECT TO SAID SECOND ELECTRODE, SAID ELECTRICAL CONDUCTOR BEING EXPOSED TO SAID IONIZABLE MEDIUM, BUT INCAPABLE
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) | 1964-01-03 | 1964-07-04 | 1965-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-03 | 1968-07-04 | 1969-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-03 | 1972-07-04 | 1973-01-03 | $7700.00 | Window Closed / Lapsed |