US3315154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for determining the wall thickness of metallic elements utilizing a reciprocal permanent magnet assembly
Assignee: United Gas Corp
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Filing: 1965-01-18
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Granted: 1967-04-18
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Expires: 1985-01-18
Abstract
No abstract record available.
Inventors
- 👤 Edwin D Nuttall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:37
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/90; G01N27/9013; G01N27/902; G01B; G01B7/00; G01B7/02; G01B7/06; G01B7/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
AN APPARATUS FOR DETECTING INTERNAL CORROSION WITHIN A METALLIC WALL INCLUDING, A PERMANENT MAGNET ASSEMBLY HAVING FIRST AND SECOND MAGNETS PROVIDING SPACED POLES, MEANS FOR SUPPORTING SAID MAGNET ASSEMBLY ADVANCING SAID MAGNET ASSEMBLY TRANSVERSELY WITH RESPECT TO THE EXTERNAL SURFACE OF SAID WALL TO INDUCE MAGNETIC FLUX IN SUCCESSIVE PATHS IN THE WALL, SAID ASSEMBLY ALSO HAVING A THIRD MAGNET PROVIDING A FLUX RETURN PATH FROM THE WALL BEING SURVEYED, AN ELECTRIC COIL SENSITIVE TO FLUX VARIATIONS POSITIONED IN SAID FLUX RETURN PATH, MEANS FOR RECIPROCATING SAID COIL AND THIRD MAGNET IN A LONGITUDINAL PATH BETWEEN SAID FIRST AND SECOND MAGNETS, AND MEANS FOR MEASURING THE EFFECT OF FLUX VARIATIONS AS CAUSED BY CHANGES IN THE CROSS-SECTIONAL AREA OF THE WALL UNDER INVESTIGATION UPON SAID COIL.
Claim 2
Independent Claim
126 words
AN APPARATUS FOR DETECTING INTERNAL CORROSION WITHIN A METALLIC WALL INCLUDING, A PERMANENT MAGNET ASSEMBLY HAVING FIRST AND SECOND MAGNETS PROVIDING SPACED POLES, MEANS FOR SUPPORTING SAID MAGNET ASSEMBLY ADVANCING SAID MAGNET ASSEMBLY TRANSVERSELY WITH RESPECT TO THE EXTERNAL SURFACE OF SAID WALL TO INDUCE MAGNETIC FLUX IN SUCCESSIVE PATHS IN THE WALL, SAID ASSEMBLY ALSO HAVING A THIRD MAGNET PROVIDING A FLUX RETURN PATH FROM THE WALL BEING SURVEYED, AN ELECTRIC COIL SENSITIVE TO FLUX VARIATIONS POSITIONED IN SAID FLUX RETURN PATH, MEANS FOR RECIPROCATING SAID COIL AND THIRD MAGNET IN A LONGITUDINAL PATH BETWEEN SAID FIRST AND SECOND MAGNETS, AND MEANS FOR MEASURING THE EFFECT OF FLUX VARIATIONS AS CAUSED BY CHANGES IN THE CROSS-SECTIONAL AREA OF THE WALL UNDER INVESTIGATION UPON SAID COIL.
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) | 1970-04-17 | 1970-10-17 | 1971-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-17 | 1974-10-17 | 1975-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-17 | 1978-10-17 | 1979-04-18 | $7700.00 | Window Closed / Lapsed |