Patent US3305771A successfully refreshed from Google Patents.
US3305771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inductive resistivity guard logging apparatus including toroidal coils mounted on a conductive stem
Assignee: ARPS CORP
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Filing: 1963-08-30
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Granted: 1967-02-21
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Expires: 1983-08-30
Abstract
No abstract record available.
Inventors
- 👤 Jan J Arps
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:06
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/26; G01V3/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
A SYSTEM FOR LOGGING A WELL WHICH COMPRISES: (A) A CONDUCTIVE STEM EXTENDING ALONG SAID WELL AND MOVABLE ALONG SAID WELL PAST SUCCESSIVE EARTH FORMATIONS THROUGH WHICH SAID WELL PASSES, (B) A PAIR OF TOROIDAL TRANSMITTING COILS ENCOMPASSING SAID STEM AT PREDETERMINED LONGITUDINALLY SPACED POINTS, (C) ELECTRICAL SOURCE MEANS CONNECTING SAID COILS IN OPPOSING SENSES FOR APPLYING ALTERNATING CURRENT TO SAID COILS TO INDUCE INSTANTANEOUSLY OPPOSED ELECTRICAL CURRENT FLOW THROUGH SAID STEM IN THE REGION BETWEEN SAID COILS AND FROM SAID REGION INTO THE FORMATIONS ADJACENT TO SAID REGION, (D) A PAIR OF LONGITUDINALLY SPACED TOROIDAL DETECTOR COILS ENCOMPASSING SAID STEM IN A SYMMETRICAL ARRAY BETWEEN SAID TRANSMITTING COILS, FOR INDUCTION THEREIN OF SIGNALS DEPENDENT UPON SAID CURRENT FLOW IN SAID STEM INTO FORMATIONS FACING SAID REGION, AND (E) A SIGNAL UTILIZATION MEANS CONNECTED TO SAID DETECTOR COILS FOR COMBINING THE SIGNALS FROM SAID COILS
Claim 2
Independent Claim
145 words
A SYSTEM FOR LOGGING A WELL WHICH COMPRISES: (A) A CONDUCTIVE STEM EXTENDING ALONG SAID WELL AND MOVABLE ALONG SAID WELL PAST SUCCESSIVE EARTH FORMATIONS THROUGH WHICH SAID WELL PASSES, (B) A PAIR OF TOROIDAL TRANSMITTING COILS ENCOMPASSING SAID STEM AT PREDETERMINED LONGITUDINALLY SPACED POINTS, (C) ELECTRICAL SOURCE MEANS CONNECTING SAID COILS IN OPPOSING SENSES FOR APPLYING ALTERNATING CURRENT TO SAID COILS TO INDUCE INSTANTANEOUSLY OPPOSED ELECTRICAL CURRENT FLOW THROUGH SAID STEM IN THE REGION BETWEEN SAID COILS AND FROM SAID REGION INTO THE FORMATIONS ADJACENT TO SAID REGION, (D) A PAIR OF LONGITUDINALLY SPACED TOROIDAL DETECTOR COILS ENCOMPASSING SAID STEM IN A SYMMETRICAL ARRAY BETWEEN SAID TRANSMITTING COILS, FOR INDUCTION THEREIN OF SIGNALS DEPENDENT UPON SAID CURRENT FLOW IN SAID STEM INTO FORMATIONS FACING SAID REGION, AND (E) A SIGNAL UTILIZATION MEANS CONNECTED TO SAID DETECTOR COILS FOR COMBINING THE SIGNALS FROM SAID COILS
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) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |