Patent US3713107A successfully refreshed from Google Patents.
US3631718A
Expired / Lapsed
US
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Electromagnetic flowmeter
Assignee: Individual
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Filing: 1970-07-14
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Granted: 1972-01-04
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Expires: 1990-07-14
Abstract
Abstract An electromagnetic flowmeter comprising a conduit of nonmagnetic material for passing therethrough a liquid to be measured, a permanent magnet of cylindrical shape mounted on the outer circumferential surface of said conduit in concentric relationship, two radial openings formed in two positions diametrically opposed to each other on said permanent magnet in substantially the central portion axially of the magnet, two electrodes mounted in said two radial openings respectively, and external magnetic field shield means mounted around said permanent magnet in enclosing relationship.
Inventors
- 👤 Tetsuya Sato
- 👤 Haruo Miyatake
- 👤 Osamu Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:13
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/56; G01F1/58; G01F1/588
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
83 words
An electromagnetic flowmeter comprising a conduit of nonmagnetic material for passing therethrough a liquid to be measured, a permanent magnet of cylindrical shape mounted on the outer circumferential surface of said conduit in concentric relationship, two radial openings formed in two positions diametrically opposed to each other on said permanent magnet in substantially the central portion axially of the magnet, two electrodes mounted in said two radial openings respectively, and external magnetic field shield means mounted around said permanent magnet in enclosing relationship.
Claim 2
Dependent Claim
83 words
An electromagnetic flowmeter comprising a conduit of nonmagnetic material for passing therethrough a liquid to be measured, a permanent magnet of cylindrical shape mounted on the outer circumferential surface of said conduit in concentric relationship, two radial openings formed in two positions diametrically opposed to each other on said permanent magnet in substantially the central portion axially of the magnet, two electrodes mounted in said two radial openings respectively, and external magnetic field shield means mounted around said permanent magnet in enclosing relationship.
Claim 3
Dependent Claim
24 words
An electromagnetic flowmeter as defined in claim 1 wherein said permanent magnet in cylindrical shape is formed in two pieces each in semicylindrical shape.
Claim 4
Dependent Claim
77 words
An electromagnetic flowmeter as defined in claim 1 wherein said external magnetic field shield means comprises a set of cylindrical shields and a set of annular shields, said cylindrical shields and said annular shields being arranged such that the cylindrical shields are concentric with said permanent magnet and the annular shields are disposed at opposite ends of the cylindrical shields, said shields being spaced apart from one another and from the permanent magnet by a small clearance.
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |