US3317824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for magnetically inspecting ferromagnetic members for inside and outside surface discontinuities and ascertaining therebetween
Assignee: AMF Inc
•
Filing: 1963-03-21
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Granted: 1967-05-02
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Expires: 1983-03-21
Abstract
No abstract record available.
Inventors
- 👤 Fenton M Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:21
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/90; G01N27/9013; G01N27/902; E; E21; E21B; E21B47/00; E21B47/006; E21B47/08; E21B47/085; G01N27/904; G01N27/9093
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
THE METHOD OF DETECTING BOTH INSIDE AND OUTSIDE SURFACE DISCONTINUITIES IN AN ELONGATE FERROMAGNETIC MEMBER HAVING AN INSIDE SURFACE RADIALLY SEPARATED FROM ITS OUTSIDE SURFACE, COMPRISING THE STEPS OF: ESTABLISHING A MAGNETIC FIELD WITH LONGITUDINAL FLUX LINES WHICH EXTEND LONGITUDINALLY THROUGH SAID FERROMAGNETIC MEMBER AND RADIAL FLUX LINES THAT EXTEND FROM SAID MEMBER, CAUSING RELATIVE MOVEMENT BETWEEN SAID FIELD AND SAID MEMBER IN A DIRECTION GENERALLY PARALLEL TO THE LONGITUDINAL FLUX LINES OF SAID FIELD, DETECTING VARIATIONS IN FLUX LEAKAGE OF SAID LONGITUDINAL FLUX LINES DURING SUCH RELATIVE MOVEMENT AS AN INDICATION OF A DISCONTINUITY IN AT LEAST ONE OF THE SURFACES OF SAID MEMBERS, AND DETECTING VARIATIONS IN THE FLUX DENSITY OF SAID RADIAL FLUX LINES ADJACENT THE SURFACE FROM WHICH THEY EXTEND DURING SUCH RELATIVE MOVEMENT AS AN INDICATION OF DISCONTINUITY IN THE SURFACE OF SAID MEMBER ADJACENT WHICH VARIATION IN THE FLUX DENSITY IS DETECTED.
Claim 2
Independent Claim
148 words
THE METHOD OF DETECTING BOTH INSIDE AND OUTSIDE SURFACE DISCONTINUITIES IN AN ELONGATE FERROMAGNETIC MEMBER HAVING AN INSIDE SURFACE RADIALLY SEPARATED FROM ITS OUTSIDE SURFACE, COMPRISING THE STEPS OF: ESTABLISHING A MAGNETIC FIELD WITH LONGITUDINAL FLUX LINES WHICH EXTEND LONGITUDINALLY THROUGH SAID FERROMAGNETIC MEMBER AND RADIAL FLUX LINES THAT EXTEND FROM SAID MEMBER, CAUSING RELATIVE MOVEMENT BETWEEN SAID FIELD AND SAID MEMBER IN A DIRECTION GENERALLY PARALLEL TO THE LONGITUDINAL FLUX LINES OF SAID FIELD, DETECTING VARIATIONS IN FLUX LEAKAGE OF SAID LONGITUDINAL FLUX LINES DURING SUCH RELATIVE MOVEMENT AS AN INDICATION OF A DISCONTINUITY IN AT LEAST ONE OF THE SURFACES OF SAID MEMBERS, AND DETECTING VARIATIONS IN THE FLUX DENSITY OF SAID RADIAL FLUX LINES ADJACENT THE SURFACE FROM WHICH THEY EXTEND DURING SUCH RELATIVE MOVEMENT AS AN INDICATION OF DISCONTINUITY IN THE SURFACE OF SAID MEMBER ADJACENT WHICH VARIATION IN THE FLUX DENSITY IS DETECTED.
References Cited (Backward Citations)
US1946196A
Cited
US2869073A
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US2881387A
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US2770773A
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US2992390A
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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) | 1970-05-01 | 1970-10-31 | 1971-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-01 | 1974-10-31 | 1975-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-01 | 1978-10-31 | 1979-05-02 | $7700.00 | Window Closed / Lapsed |