US3075145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic detection of flaws using mutually coupled coils
Assignee: Imperial Chemical Industries Ltd
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Filing: 1958-11-25
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Granted: 1963-01-22
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Expires: 1978-11-25
Abstract
No abstract record available.
Inventors
- 👤 Goldberg Samuel Sidney
- 👤 Perriam Leonard Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:26
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/90; G01N27/9006; G01N27/9013; G01N27/902
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
APPARATUS FOR NONDESTRUCTIVELY MAGNETICALL TESTING ELONGATE METALLIC ARTICLES FOR FLAWS COMPRISING: A PROBE DEVICE SPEEDILY MOVABLE RELATIVE TO SAID ARTICLE UNDER TEST AND INCLUDING, TO THE EXCLUSION OF ANY ARTICLE TO BE OR BEING TESTED, A CORE CARRYING TWO MUTUALLY COUPLED COILS EACH HAVING TWO ENDS WITH SAID COILS BEING SERIALLY CONNECTED VIA ONE OF SAID ENDS OF EACH COIL; AN ALTERNATING CURRENT SOURCE SERIALLY CONNECTED TO THE OTHER END OF ONE OF SAID COILS; AND AN ELECTRICAL BRIDGE CIRCUIT HAVING A PART COUPLED ACROSS THE SERIAL COMBINATION OF SAID ONE COIL AND SOURCE WITH SAID BRIDGE CIRCUIT OTHERWISE INCLUDING AS BETWEEN SAID TWO COILS ONLY THE OTHER THEREOF FOR EFFECTING A MEASUREMENT OF THE MUTUAL INDUCTANCE BETWEEN SAID COILS.
Claim 2
Dependent Claim
120 words
APPARATUS FOR NONDESTRUCTIVELY MAGNETICALL TESTING ELONGATE METALLIC ARTICLES FOR FLAWS COMPRISING: A PROBE DEVICE SPEEDILY MOVABLE RELATIVE TO SAID ARTICLE UNDER TEST AND INCLUDING, TO THE EXCLUSION OF ANY ARTICLE TO BE OR BEING TESTED, A CORE CARRYING TWO MUTUALLY COUPLED COILS EACH HAVING TWO ENDS WITH SAID COILS BEING SERIALLY CONNECTED VIA ONE OF SAID ENDS OF EACH COIL; AN ALTERNATING CURRENT SOURCE SERIALLY CONNECTED TO THE OTHER END OF ONE OF SAID COILS; AND AN ELECTRICAL BRIDGE CIRCUIT HAVING A PART COUPLED ACROSS THE SERIAL COMBINATION OF SAID ONE COIL AND SOURCE WITH SAID BRIDGE CIRCUIT OTHERWISE INCLUDING AS BETWEEN SAID TWO COILS ONLY THE OTHER THEREOF FOR EFFECTING A MEASUREMENT OF THE MUTUAL INDUCTANCE BETWEEN SAID COILS.
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) | 1966-01-21 | 1966-07-23 | 1967-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-21 | 1970-07-23 | 1971-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-21 | 1974-07-23 | 1975-01-22 | $7700.00 | Window Closed / Lapsed |