US3745824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insert type electromagnetic flowmeter
Assignee: Fischer and Porter Co
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Filing: 1971-09-14
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Granted: 1973-07-17
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Expires: 1991-09-14
Abstract
Abstract An electromagnetic flowmeter which is insertable within a pipe line conducting a fluid whose flow rate is to be measured. The flowmeter includes a flow-tube assembly of small radial thickness constituted by concentrically-arranged inner and outer tubes defining an annular region. This region is occupied by an electrostatic shield, a pair of oppositely-disposed flat coils contoured to conform to the curvature of the inner tube to establish a magnetic field in a direction mutually perpendicular to the longitudinal axis of the inner tube and to the axis of the electrodes installed thereon, and a magnetic shell surrounding the coils. The remaining space in the region is filled with a potting compound to seal the components therein.
Inventors
- 👤 E Mannherz
- 👤 J Yard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:33
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/56; G01F1/58; G01F1/586; G01F15/00; G01F15/18
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
156 words
An insert-type electromagnetic flowmeter, said flowmeter being provided with a flow-tube assembly of relatively small radial thickness adapted to fit within a line pipe conducting the fluid to be metered, said flow-meter assembly comprising: A. concentrically-disposed inner and outer tubes of uniform diameter defining an annular region; B. a pair of flat coils symmetrically disposed within said region about said inner tube and contoured to conform to the curvature thereof, C. a magnetically -permeable shell surrounding said coils, said shell being adjacent the outer tube, D. a potting compound filling the remaining space in said region to seal in the components disposed therein, and E. a mounting flange mounted at the end of said assembly, said flange being constituted by two joined sections, one of which is secured to the end of the inner tube and the other to the end of the outer tube, leads from the coils being sandwiched protectively between the joined sections.
Claim 2
Dependent Claim
156 words
An insert-type electromagnetic flowmeter, said flowmeter being provided with a flow-tube assembly of relatively small radial thickness adapted to fit within a line pipe conducting the fluid to be metered, said flow-meter assembly comprising: A. concentrically-disposed inner and outer tubes of uniform diameter defining an annular region; B. a pair of flat coils symmetrically disposed within said region about said inner tube and contoured to conform to the curvature thereof, C. a magnetically -permeable shell surrounding said coils, said shell being adjacent the outer tube, D. a potting compound filling the remaining space in said region to seal in the components disposed therein, and E. a mounting flange mounted at the end of said assembly, said flange being constituted by two joined sections, one of which is secured to the end of the inner tube and the other to the end of the outer tube, leads from the coils being sandwiched protectively between the joined sections.
Claim 3
Dependent Claim
18 words
A flowmeter as set forth in claim 1, wherein said inner and outer tubes are fabricated of fiberglass.
Claim 4
Dependent Claim
22 words
A flowmeter as set forth in claim 1, wherein said flat coils are constituted by a spiral-wound layer having a diamond-shaped configuration.
Claim 5
Dependent Claim
28 words
A flowmeter as set forth in claim 1, further including a layer of electrically-conductive material interposed between said coils and said inner tube to provide an electrostatic shield.
Claim 6
Dependent Claim
25 words
A flowmeter as set forth in claim 4, wherein said layer is formed on the inner surface of an insulating sleeve surrounding said inner tube.
Claim 7
Dependent Claim
38 words
A flowmeter as set forth in claim 1, wherein said flange includes an extension tab, a connector box supported thereon, the leads from the coils in said region passing between the sections of the flange to said box.
Claim 8
Dependent Claim
20 words
A flowmeter as set forth in claim 1, wherein the radial thickness of said assembly is less than 1 inch.
Claim 9
Dependent Claim
42 words
A flowmeter as set forth in claim 1, wherein the outer tube of the flow-tube assembly is spaced from the inner surface of the pipe in which the assembly is inserted, to define an annular passage into which the fluid is admitted.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |