Patent US3251302A successfully refreshed from Google Patents.
US3251302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helical electromagnetic pump
Assignee: North American Aviation Corp
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Filing: 1963-09-16
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Granted: 1966-05-17
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Expires: 1983-09-16
Abstract
No abstract record available.
Inventors
- 👤 Richard S Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:29
CPC Classifications
F; F04; F04D; F04D3/00; F04D13/00; F04D13/02; F04D13/06; F04D13/0606; F04D13/064; H; H02; H02K; H02K44/00; H02K44/02; H02K44/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
AN ELECTROMAGNETIC PUMP FOR PUMPING ELECTRICALLY CONDUCTING FLUIDS COMPRISING: (A) A GENERALLY CYLINDRICAL FIRST MEMBER HAVING A LONGITUDINAL AXIS, (B) A GENERALLY CYLINDRICAL SECOND MEMBER SUBSTANTIALLY CONCENTRIC WITH AND SPACED APART FROM SAID FIRST MEMBER, (C) A LONGITUDINALLY EXTENDING PUMP REGION DEVELOPED BETWEEN SAID SPACED APART FIRST AND SECOND CYLINDRICAL MEMBERS, (D) A LONGITUDINALLY EXTENDING MAGNET MEANS POSITIONED SUBSTANTIALLY WITHIN SAID FIRST CYLINDRICAL MEMBER, (E) AT LEAST ONE FIELD COIL OF A HELICALLY ARRANGED A.-C. POLYPHASE WINDING ASSOCIATED WITH SAID MAGNET MEANS, (F) DRIVING MEANS ADAPTED TO ROTATE SAID MAGNET MEANS IN AN ADDITIVE OR SUBSTRACTIVE MANNER, (G) A CIRCUMFERENTIALLY EXTENDING FLUX RETURN PATH MEANS ASSOCIATED WITH SAID SECOND CYLINDRICAL MEMBER,
Claim 2
Dependent Claim
111 words
AN ELECTROMAGNETIC PUMP FOR PUMPING ELECTRICALLY CONDUCTING FLUIDS COMPRISING: (A) A GENERALLY CYLINDRICAL FIRST MEMBER HAVING A LONGITUDINAL AXIS, (B) A GENERALLY CYLINDRICAL SECOND MEMBER SUBSTANTIALLY CONCENTRIC WITH AND SPACED APART FROM SAID FIRST MEMBER, (C) A LONGITUDINALLY EXTENDING PUMP REGION DEVELOPED BETWEEN SAID SPACED APART FIRST AND SECOND CYLINDRICAL MEMBERS, (D) A LONGITUDINALLY EXTENDING MAGNET MEANS POSITIONED SUBSTANTIALLY WITHIN SAID FIRST CYLINDRICAL MEMBER, (E) AT LEAST ONE FIELD COIL OF A HELICALLY ARRANGED A.-C. POLYPHASE WINDING ASSOCIATED WITH SAID MAGNET MEANS, (F) DRIVING MEANS ADAPTED TO ROTATE SAID MAGNET MEANS IN AN ADDITIVE OR SUBSTRACTIVE MANNER, (G) A CIRCUMFERENTIALLY EXTENDING FLUX RETURN PATH MEANS ASSOCIATED WITH SAID SECOND CYLINDRICAL MEMBER,
References Cited (Backward Citations)
US2786416A
Cited
US3187672A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-16 | 1969-11-15 | 1970-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-16 | 1973-11-15 | 1974-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-16 | 1977-11-15 | 1978-05-17 | $7700.00 | Window Closed / Lapsed |