US2423552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic testing apparatus
Assignee: Magnaflux Corp
•
Filing: 1942-05-28
•
Granted: 1947-07-08
•
Expires: 1962-05-28
Abstract
No abstract record available.
Inventors
- 👤 John E Clarke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:42
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/83; G01N27/84
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2217733A
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US2240812A
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US2221576A
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US2245920A
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US2277431A
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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) | 1950-07-07 | 1951-01-06 | 1951-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-07 | 1955-01-06 | 1955-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-07 | 1959-01-06 | 1959-07-08 | $7700.00 | Window Closed / Lapsed |