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Patent US3740171A successfully refreshed from Google Patents.
US3740171A
Expired / Lapsed
US
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Electromagnetic pump or motor device
Assignee: Individual
•
Filing: 1971-08-10
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Granted: 1973-06-19
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Expires: 1991-08-10
Abstract
Abstract An electromagnetic plunger-cylinder device including two alternately energized solenoid coils wound about the cylinder to reciprocate the plunger therewithin, the inner end of one coil being wrapped around the inner end of the other coil, thereby to control the stroke or air gap of the plunger.
Inventors
- 👤 R Farkos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:00
CPC Classifications
F; F04; F04B; F04B17/00; F04B17/03; F04B17/04; F04B17/042; F04B17/044; F04B5/00; F04B5/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
73 words
An electromagnetic pump or motor device comprising a cylinder having a bore therein, a plunger of magnetic material slidably received in said bore, a first solenoid coil positioned about said cylinder, and a second solenoid coil positioned about said cylinder with a portion of said second coil overlapping said first coil, said coils being alternately energized to produce respective magnetic fields for alternately attracting said plunger to reciprocate the same in said bore.
Claim 2
Dependent Claim
73 words
An electromagnetic pump or motor device comprising a cylinder having a bore therein, a plunger of magnetic material slidably received in said bore, a first solenoid coil positioned about said cylinder, and a second solenoid coil positioned about said cylinder with a portion of said second coil overlapping said first coil, said coils being alternately energized to produce respective magnetic fields for alternately attracting said plunger to reciprocate the same in said bore.
Claim 3
Dependent Claim
43 words
The electromagnetic device of claim 1 wherein a fluid is contained within said bore and said cylinder includes means at both ends of the bore to discharge said fluid during a plunger compression stroke and to receive fluid during a plunger suction stroke.
Claim 4
Dependent Claim
47 words
The electromagnetic device of claim 2 wherein each of said means comprises a valve plate assembly having two check valves therein, one of said check valves being operative to open during the compression stroke and the other check valve being operative to open during the suction stroke.
Claim 5
Dependent Claim
55 words
The electromagnetic device of claim 3 wherein the plunger in its reciprocal movement is stopped at the end of each stroke by centering on the field of force of the energized coil, the valve plate assemblies being slightly set back from the end of the bore to preclude contact between such assemblies and the plunger.
Claim 6
Dependent Claim
39 words
The electromagnetic device of claim 1 wherein the plunger is of sufficient length regardless of bore position to at least partially extend beyond the center of either coil, thereby to maintain said plunger in a potentially strong magnetic field.
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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |