Patent US2425361A successfully refreshed from Google Patents.
US2425361A
Expired / Lapsed
US
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Magnetic testing apparatus
Assignee: AT&T Inc
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Filing: 1942-12-08
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Granted: 1947-08-12
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Expires: 1962-12-08
Abstract
No abstract record available.
Inventors
- 👤 Raymond W Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:51
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/02; G01R33/028; G01R33/0283
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1317786A
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US1731239A
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US974760A
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US1094106A
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US1270100A
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US1801328A
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US2026060A
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US1851818A
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US2036856A
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US2170515A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-08-11 | 1951-02-10 | 1951-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-08-11 | 1955-02-10 | 1955-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-08-11 | 1959-02-10 | 1959-08-12 | $7700.00 | Window Closed / Lapsed |