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US2649568A
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Magnetometer
Assignee: AT&T Inc
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Filing: 1949-07-12
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Granted: 1953-08-18
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Expires: 1969-07-12
Abstract
No abstract record available.
Inventors
- 👤 Jr Edwin P Felch
- 👤 Francis G Merrill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:38
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/02; G01R33/04; G01R33/045; G01V; G01V3/00; G01V3/08; G01V3/081
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2252059A
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US2258837A
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US2390051A
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US2406870A
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US2410039A
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US2418553A
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US2417622A
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US2475421A
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US2475593A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-17 | 1957-02-16 | 1957-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-17 | 1961-02-16 | 1961-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-17 | 1965-02-16 | 1965-08-18 | $7700.00 | Window Closed / Lapsed |