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Patent US3135208A successfully refreshed from Google Patents.
US3135208A
Expired / Lapsed
US
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Magnetohydrodynamic pump
Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1962-04-30
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Granted: 1964-06-02
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Expires: 1982-04-30
Abstract
No abstract record available.
Inventors
- 👤 Otmar M Stuetzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:13
CPC Classifications
H; H02; H02K; H02K44/00; H02K44/02; H02K44/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A MAGNETOHYDRODYNAMIC PUMP FOR PUMPING CONDUCTIVE FLUIDS COMPRISING MEANS DEFINING A FLOW PATH FOR SAID FLUID, A FIRST ELECTRODE IN SAID FLOW PATH AND HAVING AN APERTURE TO PERMIT FLUID FLOW THROUGH SAID FIRST ELECTRODE, SAID FIRST ELECTRODE SUBSTANTIALLY COMPLETELY OBSTRUCTING SAID FLOW PATH EXCEPT FOR SAID APERTURE, A SECOND ELECTRODE IN SAID FLOW PATH SPACED UPSTREAM FROM SAID FIRST ELECTRODE, SAID SECOND ELECTRODE BEING SOLID AND SHAPED TO PERMIT SAID FLUID TO FLOW BETWEEN SAID FIRST AND SECOND ELECTRODES AND THROUGH SAID APERTURE IN SAID FIRST ELECTRODE, SAID APERTURE BEING FRUSTO-CONICAL IN SHAPE AND BEING WIDEST ADJACENT SAID SECOND ELECTRODE, AND SAID SECOND ELECTRODE INCLUDING A CONICAL PORTION EXTENDING INTO SAID APERTURE, AND MEANS FOR CAUSING ELECTRICAL CURRENT TO FLOW THROUGH SAID CONDUCTIVE FLUID BETWEEN SAID FIRST AND SECOND ELECTRODES TO PROVIDE A MAGNETIC FIELD IN THE SPACE BETWEEN SAID ELECTRODES.
Claim 2
Dependent Claim
142 words
A MAGNETOHYDRODYNAMIC PUMP FOR PUMPING CONDUCTIVE FLUIDS COMPRISING MEANS DEFINING A FLOW PATH FOR SAID FLUID, A FIRST ELECTRODE IN SAID FLOW PATH AND HAVING AN APERTURE TO PERMIT FLUID FLOW THROUGH SAID FIRST ELECTRODE, SAID FIRST ELECTRODE SUBSTANTIALLY COMPLETELY OBSTRUCTING SAID FLOW PATH EXCEPT FOR SAID APERTURE, A SECOND ELECTRODE IN SAID FLOW PATH SPACED UPSTREAM FROM SAID FIRST ELECTRODE, SAID SECOND ELECTRODE BEING SOLID AND SHAPED TO PERMIT SAID FLUID TO FLOW BETWEEN SAID FIRST AND SECOND ELECTRODES AND THROUGH SAID APERTURE IN SAID FIRST ELECTRODE, SAID APERTURE BEING FRUSTO-CONICAL IN SHAPE AND BEING WIDEST ADJACENT SAID SECOND ELECTRODE, AND SAID SECOND ELECTRODE INCLUDING A CONICAL PORTION EXTENDING INTO SAID APERTURE, AND MEANS FOR CAUSING ELECTRICAL CURRENT TO FLOW THROUGH SAID CONDUCTIVE FLUID BETWEEN SAID FIRST AND SECOND ELECTRODES TO PROVIDE A MAGNETIC FIELD IN THE SPACE BETWEEN SAID ELECTRODES.
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) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |