Patent US3491935A successfully refreshed from Google Patents.
Patent US2466838A successfully refreshed from Google Patents.
US3754154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealed pump and drive therefor
Assignee: Individual
•
Filing: 1971-02-08
•
Granted: 1973-08-21
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Expires: 1991-02-08
Abstract
Abstract A completely sealed magnetically driven pump havng a pistonarmature driven by electrical windings. Unique electrical driving circuits are provided for the pump embodying feed-back windings magnetically coupled with the driving windings of the pump for controlling the reciprocation. Mechanical variations are provided for variable displacement, high pressure and valve shearing action characteristics. The device is also reversible in that the piston-armature can be reciprocated mechanically whereby to generate pulsating electromotive force in the electrical windings.
Inventors
- 👤 P Massie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:34
CPC Classifications
H; H02; H02K; H02K33/00; H02K33/12; H02K33/14; F; F02; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
116 words
A sealed pump comprising: a cylinder of non-magnetic material; a free floating piston, of magnetically attractable material, slidable in said cylinder and being free of mechanical connection to the exterior of said cylinder; means closing the ends of said cylinder and having inlet and outlet ports therein; a magnetic core means having pole-defining ends having axially facing pole faces facing inwardly at opposite ends of said cylinder; permanent magnet means establishing a permanent magnetic field in said core means and through said cylinder and piston; and electrical windings disposed about said cylinder adjacent the ends thereof to produce, when energized, a magnetic field cooperable with said permanent magnetic field to reciprocate said piston in said cylinder.
Claim 2
Dependent Claim
116 words
A sealed pump comprising: a cylinder of non-magnetic material; a free floating piston, of magnetically attractable material, slidable in said cylinder and being free of mechanical connection to the exterior of said cylinder; means closing the ends of said cylinder and having inlet and outlet ports therein; a magnetic core means having pole-defining ends having axially facing pole faces facing inwardly at opposite ends of said cylinder; permanent magnet means establishing a permanent magnetic field in said core means and through said cylinder and piston; and electrical windings disposed about said cylinder adjacent the ends thereof to produce, when energized, a magnetic field cooperable with said permanent magnetic field to reciprocate said piston in said cylinder.
Claim 3
Dependent Claim
26 words
A pump as defined in claim 1 wherein said pole-defining ends of said core means extend into said cylinder and constitute said means closing said ends.
Claim 4
Dependent Claim
25 words
A pump as defined in claim 2 including inlet and outlet valves in said pole defining ends and respectively controlling said inlet and outlet ports.
Claim 5
Dependent Claim
22 words
A pump as in claim 1, including switch means for energizing the windings in a manner to cause the piston to reciprocate.
Claim 6
Dependent Claim
55 words
A pump as in claim 1, constructed to produce relatively high pressures wherein the said cylinder and piston each comprise a portion having a first diameter and a portion having a second diameter, said pole faces being configurated to be of a size comparable to a part of the piston and cylinder of larger diameter.
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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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |