US3090910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for measuring by induction the conductivity of a medium
Assignee: Schlumberger Well Surveying Corp
•
Filing: 1959-05-21
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Granted: 1963-05-21
•
Expires: 1979-05-21
Abstract
No abstract record available.
Inventors
- 👤 James H Moran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:24
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/26; G01V3/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
APPARATUS FOR MEASURING THE CONDUCTIVITY OF A MEDIUM HAVING A RANDOMLY VARYING MAGNETIC PERMEABILITY COMPRISING, MEANS INCLUDING A TRANSMITTER INDUCTOR DISPOSED IN SAID MEDIUM FOR ESTABLISHING IN SAID MEDIUM A MAGNETIC FIELD HAVING A STRENGTH WHICH VARIES FROM AN INITIAL VALUE TO FINAL VLAUE AT A RATE WHICH REMAINS SUBSTANTIALLY CONSTANT FOR ALL VALUES OF PERMEABILITY, A RECEIVE INDUCTOR DISPOSED IN INDUCTIVE RELATIONSHIP WITH SAID FIELD AND SPACED FROM SAID TRANSMITTER INDUCTOR, AND MEANS COUPLED TO SAID RECEIVER INDUCTOR FOR ELECTRICALLY SENSING WHEN THE VOLTAGE INDUCED IN SAID RECEIVER INDUCTOR ATTAINS A PREDETERMINED ABSOLUTE VALUE, SAID PREDETERMINED VALUE BEING THE SAME FOR A RANGE OF VALUES OF PERMEABILITY ON THE ACCURACY OF THE MEASUREMENT IS RENDERED NEGLIGIBLE.
Claim 2
Dependent Claim
117 words
APPARATUS FOR MEASURING THE CONDUCTIVITY OF A MEDIUM HAVING A RANDOMLY VARYING MAGNETIC PERMEABILITY COMPRISING, MEANS INCLUDING A TRANSMITTER INDUCTOR DISPOSED IN SAID MEDIUM FOR ESTABLISHING IN SAID MEDIUM A MAGNETIC FIELD HAVING A STRENGTH WHICH VARIES FROM AN INITIAL VALUE TO FINAL VLAUE AT A RATE WHICH REMAINS SUBSTANTIALLY CONSTANT FOR ALL VALUES OF PERMEABILITY, A RECEIVE INDUCTOR DISPOSED IN INDUCTIVE RELATIONSHIP WITH SAID FIELD AND SPACED FROM SAID TRANSMITTER INDUCTOR, AND MEANS COUPLED TO SAID RECEIVER INDUCTOR FOR ELECTRICALLY SENSING WHEN THE VOLTAGE INDUCED IN SAID RECEIVER INDUCTOR ATTAINS A PREDETERMINED ABSOLUTE VALUE, SAID PREDETERMINED VALUE BEING THE SAME FOR A RANGE OF VALUES OF PERMEABILITY ON THE ACCURACY OF THE MEASUREMENT IS RENDERED NEGLIGIBLE.
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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) | 1966-05-20 | 1966-11-19 | 1967-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-20 | 1970-11-19 | 1971-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-20 | 1974-11-19 | 1975-05-21 | $7700.00 | Window Closed / Lapsed |