Patent US3449662A successfully refreshed from Google Patents.
US3449662A
Expired / Lapsed
US
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Magnetic inspection method and apparatus using resilient magnetizing means and resilient sensors
Assignee: YUBOSCOPE Inc
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Filing: 1963-10-16
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Granted: 1969-06-10
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Expires: 1983-10-16
Abstract
No abstract record available.
Inventors
- 👤 Fenton M Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:33
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/90; G01N27/9013; G01N27/902; E; E21; E21B; E21B47/00; E21B47/09; E21B47/092
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
170 words
AN APPARATUS FOR TESTING TUBULAR METALLIC MEMBERS HAVING INTERNAL AND EXTERNAL CIRCUMFERENTIAL SURFACES, SAID APPARATUS COMPRISING: A RESILIENT SEARCH UNIT COMPRISING AN ANNULAR BODY MEMBER OF ELECTRICALLY NON-CONDUCTIVE , NON-MAGNETIC, ELASTOMERIC MATERIAL SHAPED TO RESILIENTLY CONTACT ONE OF SAID CIRCUNFERENTIAL SURFACES, AN ELECTRICALLY CONDUCTIVE COIL OF EXTENSIBLE AND RESILIENT MATERIAL EMBEDDED JUST UNDER THAT SURFACE OF SAID ANNULAR BODY MEMBER THAT IS CONTACTING SAID METALLIC MEMBER, WHEREBY A THIN LAYER OF FLEXIBLE, NON-MAGNETIC, ELECTRICALLY NON-CONDUCTIVE MATERIAL OVERLIES SAID COIL AND SECURES SAID COIL FROM CONTACT WITH SAID METALLIC MEMBER, MAGNETIZING MEANS FOR ESTABLISHING A MAGNETIC FIELD IN SAID METALLIC MEMBER, COMPRISING FIRST AND SECOND ANNULAR RESILIENT MAGNETICALLY CONDUCTIVE MEMBERS SPACED AXIALLY ON OPPOSITE SIDES OF SAID SEARCH UNIT AND RESILIENTLY ENGAGING SAID INE CIRCUMFERENTIAL SURFACE FOR CONDUCTING MAGNETIC FLUX OF SAID FIELD TO AND FROM SAID METALLIC MEMBER, MEANS FOR CAUSING MOVEMENT OF SAID SEARCH UNIT AND SAID MAGNETICALLY CONDUCTIVE MEMBERS RELATIVE TO SAID METALLIC MEMBER, AND ELECTRICAL DETECTION MEANS CONNECTED TO SAID COIL FOR INDICATING DEFECTS BY SAID COIL.
Claim 2
Independent Claim
170 words
AN APPARATUS FOR TESTING TUBULAR METALLIC MEMBERS HAVING INTERNAL AND EXTERNAL CIRCUMFERENTIAL SURFACES, SAID APPARATUS COMPRISING: A RESILIENT SEARCH UNIT COMPRISING AN ANNULAR BODY MEMBER OF ELECTRICALLY NON-CONDUCTIVE , NON-MAGNETIC, ELASTOMERIC MATERIAL SHAPED TO RESILIENTLY CONTACT ONE OF SAID CIRCUNFERENTIAL SURFACES, AN ELECTRICALLY CONDUCTIVE COIL OF EXTENSIBLE AND RESILIENT MATERIAL EMBEDDED JUST UNDER THAT SURFACE OF SAID ANNULAR BODY MEMBER THAT IS CONTACTING SAID METALLIC MEMBER, WHEREBY A THIN LAYER OF FLEXIBLE, NON-MAGNETIC, ELECTRICALLY NON-CONDUCTIVE MATERIAL OVERLIES SAID COIL AND SECURES SAID COIL FROM CONTACT WITH SAID METALLIC MEMBER, MAGNETIZING MEANS FOR ESTABLISHING A MAGNETIC FIELD IN SAID METALLIC MEMBER, COMPRISING FIRST AND SECOND ANNULAR RESILIENT MAGNETICALLY CONDUCTIVE MEMBERS SPACED AXIALLY ON OPPOSITE SIDES OF SAID SEARCH UNIT AND RESILIENTLY ENGAGING SAID INE CIRCUMFERENTIAL SURFACE FOR CONDUCTING MAGNETIC FLUX OF SAID FIELD TO AND FROM SAID METALLIC MEMBER, MEANS FOR CAUSING MOVEMENT OF SAID SEARCH UNIT AND SAID MAGNETICALLY CONDUCTIVE MEMBERS RELATIVE TO SAID METALLIC MEMBER, AND ELECTRICAL DETECTION MEANS CONNECTED TO SAID COIL FOR INDICATING DEFECTS BY 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) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |