Patent US3205435A successfully refreshed from Google Patents.
US3205435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus having rotating coil and magnet assembly for testing the thickness of tubular elements
Assignee: United Gas Corp
•
Filing: 1959-10-07
•
Granted: 1965-09-07
•
Expires: 1979-10-07
Abstract
No abstract record available.
Inventors
- 👤 Edwin D Nuttall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:40
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/90; G01N27/9006; G01N27/9093
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
AN APPARATUS FOR DETECTING EXTERNAL CORROSION WITHIN A TUBULAR CONDUIT INCLUDING, A PERMANENT MAGNET ASSEMBLY HAVING A POLE POSITIONED CLOSELY ADJACENT THE CONDUIT TO PROVIDE A SMALL AIR GAP THEREBETWEEN SO AS TO INDUCE MAGNETIC FLUX IN THE CONDUIT WALL, MEANS ROTATING SAID MAGNET ASSEMBLY WITHIN SAID WALL, MEANS FOR SUPPORTING SAID MAGNET ASSEMBLY AND FOR MOVING SAME THROUGH THE BORE OF THE CONDUIT, AN ELECTRIC COIL SENSITIVE TO FLUX VARIATIONS CARRIED BY SAID MEANS ROTATING SAID MAGNET AND LOCATED IN THE AIR GAP BETWEEN SAID POLE AND SAID CONDUIT, 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
115 words
AN APPARATUS FOR DETECTING EXTERNAL CORROSION WITHIN A TUBULAR CONDUIT INCLUDING, A PERMANENT MAGNET ASSEMBLY HAVING A POLE POSITIONED CLOSELY ADJACENT THE CONDUIT TO PROVIDE A SMALL AIR GAP THEREBETWEEN SO AS TO INDUCE MAGNETIC FLUX IN THE CONDUIT WALL, MEANS ROTATING SAID MAGNET ASSEMBLY WITHIN SAID WALL, MEANS FOR SUPPORTING SAID MAGNET ASSEMBLY AND FOR MOVING SAME THROUGH THE BORE OF THE CONDUIT, AN ELECTRIC COIL SENSITIVE TO FLUX VARIATIONS CARRIED BY SAID MEANS ROTATING SAID MAGNET AND LOCATED IN THE AIR GAP BETWEEN SAID POLE AND SAID CONDUIT, 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)
CH69197A
Cited
US2531413A
Cited
US2527170A
Cited
US2553350A
Cited
US2892150A
Cited
US2897438A
Cited
US2870541A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-06 | 1969-03-08 | 1969-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-06 | 1973-03-08 | 1973-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-06 | 1977-03-08 | 1977-09-07 | $7700.00 | Window Closed / Lapsed |