US3824856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-pressure electromagnetic flowmeter
Assignee: Fischer and Porter Co
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Filing: 1973-01-22
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Granted: 1974-07-23
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Expires: 1993-01-22
Abstract
Abstract An electromagnetic flowmeter having a thin-wall, non-magnetic flow tube surrounded by coils to establish an electromagnetic field in the flow passage. A heavy-wall case is supported concentrically with respect to the flow tube to define an annular region occupied, in part, by the coils and filled with a rigid potting compound, whereby the thin-wall flow tube which minimizes eddy current losses and satisfies the requirement for electromagnetic efficiency, is physically reinforced by the case and is rendered capable of withstanding heavy fluid pressures.
Inventors
- 👤 J Yard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:03
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/56; G01F1/58; G01F1/588
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
170 words
An electromagnetic flowmeter comprising: A. a relatively thin flow tube of non-magnetic material providing a passage for a fluid to be measured, B. coils disposed on the exterior of the tube to create an electromagnetic field within the passage, said coils being constituted by a pair of saddle-shaped coils symmetrically arranged on the upper and lower halves of the tube and contoured to conform to the curvature of the tube, C. a thick-wall case concentrically surrounding the tube to define an annular region which is partly occupied by the coils, said case being formed of ferromagnetic material to form a return path for magnetic flux produced by said coils, D. a pair of mounting flanges attached to the ends of said flow tube, the ends of said case being affixed to said flanges whereby said annular region is enclosed thereby, and E. a potting compound of rigid insulating material filling said annular region whereby said tube is reinforced by said case to provide a flowmeter having a high pressure rating.
Claim 2
Dependent Claim
170 words
An electromagnetic flowmeter comprising: A. a relatively thin flow tube of non-magnetic material providing a passage for a fluid to be measured, B. coils disposed on the exterior of the tube to create an electromagnetic field within the passage, said coils being constituted by a pair of saddle-shaped coils symmetrically arranged on the upper and lower halves of the tube and contoured to conform to the curvature of the tube, C. a thick-wall case concentrically surrounding the tube to define an annular region which is partly occupied by the coils, said case being formed of ferromagnetic material to form a return path for magnetic flux produced by said coils, D. a pair of mounting flanges attached to the ends of said flow tube, the ends of said case being affixed to said flanges whereby said annular region is enclosed thereby, and E. a potting compound of rigid insulating material filling said annular region whereby said tube is reinforced by said case to provide a flowmeter having a high pressure rating.
Claim 3
Dependent Claim
17 words
A flowmeter as set forth in claim 1, wherein said flow tube is formed of stainless steel.
Claim 4
Dependent Claim
17 words
A flowmeter as set forth in claim 1, wherein said flow tube is formed of fiber glass.
Claim 5
Dependent Claim
16 words
A flowmeter as set forth in claim 1, wherein said potting compound is a glass-filled epoxy.
Claim 6
Dependent Claim
26 words
A flowmeter as set forth in claim 1, further including a pair of electrodes disposed at diametrically opposed positions on said flow tube and insulated therefrom.
Claim 7
Dependent Claim
32 words
A flowmeter as set forth in claim 1, further including an insulating liner disposed within said flow tube and having end flanges which lie against the outer faces of said mounting flanges.
References Cited (Backward Citations)
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US3334518A
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US3274831A
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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) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |