Patent US3834232A successfully refreshed from Google Patents.
US3834232A
Expired / Lapsed
US
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Electromagnetic flowmeter having self-cleaning electrodes
Assignee: ABB Automation Inc
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Filing: 1972-08-22
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Granted: 1974-09-10
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Expires: 1992-08-22
Abstract
Abstract Electromagnetic flowmeter electrodes having flat surfaces lying at angle of around 30* to the direction of flow. Each electrode surface consists of a relatively small conductive area surrounded by a relatively large insulating area.
Inventors
- 👤 H Gruner
- 👤 C Heisig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:15
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/56; G01F1/58; G01F1/584; G01F1/588
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
164 words
An electromagnetic flowmeter having a passage, said passage and the inner wall of said passage being constructed and arranged for having electrode-fouling fluent flowing through said passage, said passage having a pair of electrodes therein, said electrodes being mounted on said wall and on opposite sides of said passage from each other; said flowmeter including magnetic means for creating a magnetic field in said passage and directed transversely of a line joining said electrodes, and of the direction of flow of said fluent; each said electrode having an electrically conductive element projecting from Said wall and into said passage, said element being covered by electrical insulation except at a surface portion thereof spaced from said wall and in said passage; said insulation having a surface area extending continuously around and next-adjacent said surface portion; said surface area and said surface portion each lying inclined to said direction at about the same angle-throughout about the entire extent of said surface area and said surface portion.
Claim 2
Dependent Claim
164 words
An electromagnetic flowmeter having a passage, said passage and the inner wall of said passage being constructed and arranged for having electrode-fouling fluent flowing through said passage, said passage having a pair of electrodes therein, said electrodes being mounted on said wall and on opposite sides of said passage from each other; said flowmeter including magnetic means for creating a magnetic field in said passage and directed transversely of a line joining said electrodes, and of the direction of flow of said fluent; each said electrode having an electrically conductive element projecting from Said wall and into said passage, said element being covered by electrical insulation except at a surface portion thereof spaced from said wall and in said passage; said insulation having a surface area extending continuously around and next-adjacent said surface portion; said surface area and said surface portion each lying inclined to said direction at about the same angle-throughout about the entire extent of said surface area and said surface portion.
Claim 3
Dependent Claim
49 words
The electromagnetic flowmeter of claim 1, wherein said element provides the body of said electrode, and has a surface area lying transverse to said direction like said surface portion thereof, said surface area of said insulation being provided as a coating coincident with said surface area of said element.
Claim 4
Dependent Claim
27 words
The electromagnetic flowmeter of claim 1, wherein said insulation provides the body of said electrode, and said element is an elongated electric conductor embedded in said insulation.
Claim 5
Dependent Claim
17 words
The electromagnetic flowmeter of claim 1, wherein said surface area and said surface portion are substantially flat.
Claim 6
Dependent Claim
25 words
The electromagnetic flowmeter of claim 1, wherein said surface area and said surface portion are substantially flat and one thereof is elevated above the other.
Claim 7
Dependent Claim
24 words
The electromagnetic flowmeter of claim 1, wherein said surface area and said surface portion overall define a surface which is convex toward said flow.
Claim 8
Dependent Claim
22 words
The electromagnetic flowmeter of claim 1, wherein said surface portion is substantially flush with the next adjacent boundary of said surface area.
Claim 9
Dependent Claim
21 words
The electromagnetic flowmeter of claim 7, wherein said surface portion is flat and said surface area is convex toward said flow.
Claim 10
Dependent Claim
99 words
In electromagnetically metering flow of liquid fluent flowing in a pipe wherein flow-induced voltages are detected by inserting an electrode into said fluent, and wherein said electrode is of the type having an electrically conductive surface surrounded by an electrically insulating surface, the periphery of which is everywhere spaced from the periphery of said electrically-conductive surface, the method of preventing electrically shorting said electrode, wherein such shorting would be due to deposition of conductive material carried by said fluent on the wall of said pipe and on said electrode, the method of cleaning said electrode comprising the step of
Claim 11
Dependent Claim
99 words
In electromagnetically metering flow of liquid fluent flowing in a pipe wherein flow-induced voltages are detected by inserting an electrode into said fluent, and wherein said electrode is of the type having an electrically conductive surface surrounded by an electrically insulating surface, the periphery of which is everywhere spaced from the periphery of said electrically-conductive surface, the method of preventing electrically shorting said electrode, wherein such shorting would be due to deposition of conductive material carried by said fluent on the wall of said pipe and on said electrode, the method of cleaning said electrode comprising the step of
Claim 12
Dependent Claim
25 words
The method of claim 9, also including the step of orienting said electrical conductive surface where said fluent simultaneously flows against substantially every point thereof.
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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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |