Patent US2798408A successfully refreshed from Google Patents.
US3249869A
Expired / Lapsed
US
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Apparatus for measuring the electrical properties of a conductive moving fluid
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1961-01-03
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Granted: 1966-05-03
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Expires: 1981-01-03
Abstract
No abstract record available.
Inventors
- 👤 Rudolf X Meyer
- 👤 Allen E Fuhs
- 👤 Allan B Schaffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:12
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
APPARATUS FOR MEASURING THE ELECTRICAL CONDUCTIVITY OF AN IONIZED, MOVING PLASMA FLOWING ADJACENT TO AN ELECTRICALLY CONDUCTIVE WALL WHEN THE VELOCITY THEREOF IS KNOWN COMPRISING MEANS FOR GENERATING A TIME VARIANT MAGNETIC FIELD EXTENDING INTO A PLASMA REGION, SENSING MEANS LOCATED IN A POSITION WHERE THE MAGNETIC FIELD STRENGTH IS A MINIMUM IN THE ABSENCE OF THE MOVING PLASMA AND RESPONSIVE TO A DISTORTION OF THE MAGNETIC FIELD BY THE MOVING PLASMA RESULTING FROM AN INDUCED CURRENT DENSITY AUXB WITHIN THE PLASMA IN RESPONSE TO AN INDUCED ELECTRIC FIELD UXB WHERE B IS THE MAGNETIC FLUX DENSITY, U IS THE PLASMA VELOCITY, AND A IS THE ELECTRICAL CONDUCTIVITY OF THE PLASMA, AND COIL MEANS LINKING SAID TIME VARIANT MAGNETIC FIELD FOR REDUCING SAID MINIMUM MAGNETIC FIELD STRENGTH SUBSTANTIALLY TO ZERO BY COMPENSATING FOR VARIATIONS IN THE FIELD GENERATING MEANS AND FOR THE UNWANTED EFFECTS OF INDUCED EDDY CURRENTS IN SAID ELECTRICALLY CONDUCTIVE WALL.
Claim 2
Dependent Claim
153 words
APPARATUS FOR MEASURING THE ELECTRICAL CONDUCTIVITY OF AN IONIZED, MOVING PLASMA FLOWING ADJACENT TO AN ELECTRICALLY CONDUCTIVE WALL WHEN THE VELOCITY THEREOF IS KNOWN COMPRISING MEANS FOR GENERATING A TIME VARIANT MAGNETIC FIELD EXTENDING INTO A PLASMA REGION, SENSING MEANS LOCATED IN A POSITION WHERE THE MAGNETIC FIELD STRENGTH IS A MINIMUM IN THE ABSENCE OF THE MOVING PLASMA AND RESPONSIVE TO A DISTORTION OF THE MAGNETIC FIELD BY THE MOVING PLASMA RESULTING FROM AN INDUCED CURRENT DENSITY AUXB WITHIN THE PLASMA IN RESPONSE TO AN INDUCED ELECTRIC FIELD UXB WHERE B IS THE MAGNETIC FLUX DENSITY, U IS THE PLASMA VELOCITY, AND A IS THE ELECTRICAL CONDUCTIVITY OF THE PLASMA, AND COIL MEANS LINKING SAID TIME VARIANT MAGNETIC FIELD FOR REDUCING SAID MINIMUM MAGNETIC FIELD STRENGTH SUBSTANTIALLY TO ZERO BY COMPENSATING FOR VARIATIONS IN THE FIELD GENERATING MEANS AND FOR THE UNWANTED EFFECTS OF INDUCED EDDY CURRENTS IN SAID ELECTRICALLY CONDUCTIVE WALL.
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) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |