US2497855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flaw detecting method and apparatus for ferromagnetic bodies
Assignee: Individual
•
Filing: 1944-01-17
•
Granted: 1950-02-21
•
Expires: 1964-01-17
Abstract
No abstract record available.
Inventors
- 👤 Walter C Barnes
- 👤 Henry W Keevil
- 👤 John C Dionne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:49
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/90; G01N27/9006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2317719A
Cited
US2218784A
Cited
US2223371A
Cited
US2311715A
Cited
US2317718A
Cited
US2221570A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-20 | 1953-08-22 | 1954-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-20 | 1957-08-22 | 1958-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-20 | 1961-08-22 | 1962-02-21 | $7700.00 | Window Closed / Lapsed |