US3693440A
Expired / Lapsed
US
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Electromagnetic flowmeter
Assignee: United States Department of the Navy
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Filing: 1969-03-21
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Granted: 1972-09-26
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Expires: 1989-03-21
Abstract
Abstract An electromagnetic flowmeter which has an ''''open'''' cage construction of magnet coils and electrodes arranged to achieve an angular response which closely approximates a true cosine, resulting from unrestricted fluid flow through the magnetic field.
Inventors
- 👤 Jack R Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:47
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/56; G01F1/58; G01P; G01P5/00; G01P5/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
102 words
An electromagnetic flowmeter for measuring the velocity of an electrically conductive fluid medium comprising air-core type coil means for creating a magnetic field, the coil means being open to permit the flow of the fluid medium therethrough; means for connecting said coil means to a source of power; electrode means suspended within said magnetic field for measuring the potential gradient in the fluid medium moving through the magnetic field; means for connecting said electrode means to a measuring circuit; said coil means and electrode means providing an ''''open'''' construction enabling unrestricted flow of said fluid medium through the flowmeter from any direction.
Claim 2
Dependent Claim
102 words
An electromagnetic flowmeter for measuring the velocity of an electrically conductive fluid medium comprising air-core type coil means for creating a magnetic field, the coil means being open to permit the flow of the fluid medium therethrough; means for connecting said coil means to a source of power; electrode means suspended within said magnetic field for measuring the potential gradient in the fluid medium moving through the magnetic field; means for connecting said electrode means to a measuring circuit; said coil means and electrode means providing an ''''open'''' construction enabling unrestricted flow of said fluid medium through the flowmeter from any direction.
Claim 3
Dependent Claim
44 words
The flowmeter of claim 1 wherein: said coil means comprises a pair of spaced coils; a plurality of insulator rods transversely connecting said coils in spaced parallel arrangement; said transverse insulator rods being peripherally spaced around said coils to form an ''''open'''' cage construction.
Claim 4
Dependent Claim
15 words
The flowmeter of claim 2 wherein said pair of coils are connected together in series.
Claim 5
Dependent Claim
30 words
The flowmeter of claim 2 wherein said electrode means comprises a pair of spaced electrodes mounted on an insulator support connected to and suspended between oppositely disposed transverse insulator rods.
Claim 6
Dependent Claim
22 words
The flowmeter of claim 4 wherein planes containing said coils and the plane containing the electrodes are all parallel to each other.
Claim 7
Dependent Claim
45 words
The flowmeter of claim 2 wherein said electrode means comprises two pairs of spaced electrodes, each pair of electrodes mounted on an insulator support connected to and suspended between oppositely disposed transverse insulator rods, said insulator supports being disposed at right angles to each other.
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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |