US3924466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic flowmeter with improved field coil
Assignee: Honeywell Inc
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Filing: 1974-10-21
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Granted: 1975-12-09
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Expires: 1994-10-21
Abstract
Abstract A magnetic flowmeter has a pair of coils each comprising a conductive pattern carried by a flexible insulating base. Each insulating base is wrapped partially around and secured to a cylindrical tube constructed of electrically insulating material. The patterns can be easily designed to produce a desired magnetic field pattern.
Inventors
- 👤 Lewis A Medlar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:55
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/56; G01F1/58; G01F1/588
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
101 words
A magnetic flowmeter comprising in combination: a flow tube; a pair of electrical conducting coils for producing a magnetic field; each of said coils comprising a thin pattern of electrical conductors carried by a flexible electrically insulating base; means securing the flexible base for each of said patterns to said tube; a magnetic casing surrounding said pair of field coils and providing a magnetic return path therefore; means for coupling electric power to each of said coils; and means supporting a pair of probes so that the tip of each probe is disposed to contact a fluid flowing through said tube.
Claim 2
Dependent Claim
101 words
A magnetic flowmeter comprising in combination: a flow tube; a pair of electrical conducting coils for producing a magnetic field; each of said coils comprising a thin pattern of electrical conductors carried by a flexible electrically insulating base; means securing the flexible base for each of said patterns to said tube; a magnetic casing surrounding said pair of field coils and providing a magnetic return path therefore; means for coupling electric power to each of said coils; and means supporting a pair of probes so that the tip of each probe is disposed to contact a fluid flowing through said tube.
Claim 3
Dependent Claim
20 words
A magnetic flowmeter as in claim 1 wherein each coil pattern covers substantially one-half the circumferential area of said tube.
Claim 4
Dependent Claim
34 words
A magnetic flowmeter as in claim 2 wherein the density of conductors of the coil pattern varies as a function of region in which the conductors are located on the circumference of the tube.
Claim 5
Dependent Claim
43 words
A magnetic flowmeter as in claim 3 wherein said electrical conductors for each of said coils are formed in a planar pattern which produces a predetermined magnetic field in said tube when said coils are wrapped around the exterior surface of said tube.
Claim 6
Dependent Claim
26 words
A magnetic flowmeter as in claim 2 wherein said casing comprises a section of pipe capable of withstanding the internal pressure generated by the flowing fluid.
Claim 7
Dependent Claim
23 words
A magnetic flowmeter as in claim 2 wherein said casing comprises a plurality of layers of magnetic material wrapped around said field coils.
Claim 8
Dependent Claim
43 words
A magnetic flowmeter as in claim 2 wherein said electrical conductors for each of said coils are formed in a planar pattern which produces a predetermined magnetic field in said tube when said coils are wrapped around the exterior surface of said tube.
Claim 9
Dependent Claim
34 words
A magnetic flowmeter as in claim 1 wherein the density of conductors of the coil pattern varies as a function of region in which the conductors are located on the circumference of the tube.
Claim 10
Dependent Claim
43 words
A magnetic flowmeter as in claim 8 wherein said electrical conductors for each of said coils are formed in a planar pattern which produces a predetermined magnetic field in said tube when said coils are wrapped around the exterior surface of said tube.
Claim 11
Dependent Claim
19 words
A magnetic flowmeter as in claim 9 wherein said conductive pattern is a photographic reproduction of a master pattern.
Claim 12
Dependent Claim
17 words
A magnetic flowmeter as in claim 10 wherein said conductive pattern is smaller than said master pattern.
Claim 13
Dependent Claim
17 words
A magnetic flowmeter as in claim 10 wherein said conductive pattern is larger than said master pattern.
Claim 14
Dependent Claim
26 words
A magnetic flowmeter as in claim 1 wherein said casing comprises a section of pipe capable of withstanding the internal pressure generated by the flowing fluid.
Claim 15
Dependent Claim
43 words
A magnetic flowmeter as in claim 13 wherein said electrical conductors for each of said coils are formed in a planar pattern which produces a predetermined magnetic field in said tube when said coils are wrapped around the exterior surface of said tube.
Claim 16
Dependent Claim
23 words
A magnetic flowmeter as in claim 1 wherein said casing comprises a plurality of layers of magnetic material wrapped around said field coils.
Claim 17
Dependent Claim
43 words
A magnetic flowmeter as in claim 1 wherein said electrical conductors for each of said coils are formed in a planar pattern which produces a predetermined magnetic field in said tube when said coils are wrapped around the exterior surface of said tube.
Claim 18
Dependent Claim
19 words
A magnetic flowmeter as in claim 16 wherein said conductive pattern is a photographic reproduction of a master pattern.
Claim 19
Dependent Claim
17 words
A magnetic flowmeter as in claim 17 wherein said conductive pattern is smaller than said master pattern.
Claim 20
Dependent Claim
17 words
A magnetic flowmeter as in claim 17 wherein said conductive pattern is larger than said master pattern.
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) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |