US3197693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nondestructive eddy current subsurface testing device providing compensation for variation in probe-to-specimen spacing and surface irregularities
Assignee: Individual
•
Filing: 1960-10-04
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Granted: 1965-07-27
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Expires: 1980-10-04
Abstract
No abstract record available.
Inventors
- 👤 Hugo L Libby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:41
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/90; G01N27/9006; G01N27/9046; G01N27/9053
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
84 words
A DEVICE FOR MEASURING DISCONTINUITY IN A METAL SAMPLE COMPRISING A PRODE HAVING TWO ANNULAR COILS MOUNTED COAXIALLY AN COPLANAR WITH RESPECT TO EACH OTHER; MEANS FOR APPLYING A VARIABLE AMPLITUDE A.-C. SIGNAL TO ONE OF SAID COILS; MEANS FOR APPLYING AN EQUALFREQUENCY AMPLITUDE-AND-PHASE VARIABLE A.-C. SIGNALS TO THE OTHER COIL; SAID A.-C. SIGNALS BEING APPLIED TO SAID COILS SIMULTANEOUSLY; AND MEANS FOR MEASURING THE RESULTANT SIGNAL ACROSS ONE OF SAID COILS, THE MEASURED RESULTANT SIGNAL BEING A MEASURE OF DISCONTINUITIES WITHIN SAID METAL.
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) | 1968-07-26 | 1969-01-25 | 1969-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-26 | 1973-01-25 | 1973-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-26 | 1977-01-25 | 1977-07-27 | $7700.00 | Window Closed / Lapsed |