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US2564777A
Expired / Lapsed
US
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Device for testing ferrous metals
Assignee: Allen B du Mont Laboratories Inc
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Filing: 1946-09-19
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Granted: 1951-08-21
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Expires: 1966-09-19
Abstract
No abstract record available.
Inventors
- 👤 Cavanagh Patrick Edgar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:10
CPC Classifications
G; G01; G01L; G01L5/00; G01L5/04; G01L5/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE21927E
Cited
US1943619A
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US2227505A
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US2070666A
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US2237254A
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US2267884A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-20 | 1955-02-19 | 1955-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-20 | 1959-02-19 | 1959-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-20 | 1963-02-19 | 1963-08-21 | $7700.00 | Window Closed / Lapsed |