Patent US3187672A successfully refreshed from Google Patents.
US3187672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic pump
Assignee: North American Aviation Corp
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Filing: 1963-01-25
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Granted: 1965-06-08
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Expires: 1983-01-25
Abstract
No abstract record available.
Inventors
- 👤 Richard S Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:21
CPC Classifications
H; H02; H02K; H02K44/00; H02K44/02; H02K44/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
178 words
AN ELECTROMAGNETIC PUMP FOR PUMPING ELECTRIALLY CONDUCTIVE LIQUIDS COMPRISING: (A) A HELICAL ROTOR MEANS HAVING AT LEAST FIRST AND SECONE POLE SURFACES, (B) A FLUX RETURN PATH MEANS ADJACENT TO SAID ROTOR MEANS, (C) A PUMP REGION JUXTAPOSED BETWEEN SAID ROTOR MEANS AND SAID FLUX RETURN MEANS, (D) AT LEAST ONE HELICAL GUIDE VANE IN SAID PUMP REGION DEFINING A HELICAL CHANNEL SKEWED CIRCUMFERENTIALLY IN A DIRECTION OPPOSITE TO SAID HELICAL ROTOR, (E) EACH OF SAID POLE SURFACES SKEWED CIRCUMFERENTIALLY TO INTERSECT SAID SKEWED HELICAL CHANNEL AT AN ANGLE OF SUBSTANTIALLY 90 DEGREES, (F) AT LEAST ONE INLET AND ONE OUTLET PORT IN SAID PUMP REGION, AND (G) MEANS ASSOCIATED WITH SAID ROTOR MEANS PROVIDING A FIELD SOURCE OF MAGNETIC FLUX ACROSS SAID PUMP REGION SO THAT ROTATION OF SAID ROTOR MEANS INDUCES EDDY CURRENTS WHICH FLOW IN PATHS IN A CONDUCTIVE LIQUID IN SAID PUMP REGION THAT CONFORM WITH THE HELICAL GEOMETRY OF SAID ROTOR MEANS AND INTERACT WITH THE MAGNETIC FLUX FIELD TO IMPART RESULTANT PUMPING FORCES FR THAT ARE SUBSTANTIALLY PARALLEL WITH SAID HELICAL CHANNEL.
Claim 2
Dependent Claim
178 words
AN ELECTROMAGNETIC PUMP FOR PUMPING ELECTRIALLY CONDUCTIVE LIQUIDS COMPRISING: (A) A HELICAL ROTOR MEANS HAVING AT LEAST FIRST AND SECONE POLE SURFACES, (B) A FLUX RETURN PATH MEANS ADJACENT TO SAID ROTOR MEANS, (C) A PUMP REGION JUXTAPOSED BETWEEN SAID ROTOR MEANS AND SAID FLUX RETURN MEANS, (D) AT LEAST ONE HELICAL GUIDE VANE IN SAID PUMP REGION DEFINING A HELICAL CHANNEL SKEWED CIRCUMFERENTIALLY IN A DIRECTION OPPOSITE TO SAID HELICAL ROTOR, (E) EACH OF SAID POLE SURFACES SKEWED CIRCUMFERENTIALLY TO INTERSECT SAID SKEWED HELICAL CHANNEL AT AN ANGLE OF SUBSTANTIALLY 90 DEGREES, (F) AT LEAST ONE INLET AND ONE OUTLET PORT IN SAID PUMP REGION, AND (G) MEANS ASSOCIATED WITH SAID ROTOR MEANS PROVIDING A FIELD SOURCE OF MAGNETIC FLUX ACROSS SAID PUMP REGION SO THAT ROTATION OF SAID ROTOR MEANS INDUCES EDDY CURRENTS WHICH FLOW IN PATHS IN A CONDUCTIVE LIQUID IN SAID PUMP REGION THAT CONFORM WITH THE HELICAL GEOMETRY OF SAID ROTOR MEANS AND INTERACT WITH THE MAGNETIC FLUX FIELD TO IMPART RESULTANT PUMPING FORCES FR THAT ARE SUBSTANTIALLY PARALLEL WITH SAID HELICAL CHANNEL.
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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) | 1968-06-07 | 1968-12-07 | 1969-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-07 | 1972-12-07 | 1973-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-07 | 1976-12-07 | 1977-06-08 | $7700.00 | Window Closed / Lapsed |