US2964700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic variometer
Assignee: Individual
•
Filing: 1953-07-22
•
Granted: 1960-12-13
•
Expires: 1973-07-22
Abstract
No abstract record available.
Inventors
- 👤 Frederick W Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:22
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1449387A
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US1264495A
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US1379916A
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US1886336A
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US2072950A
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US2406870A
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US2539270A
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US2467211A
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US2447849A
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US2440503A
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US2659859A
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US2727206A
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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) | 1963-12-13 | 1964-06-13 | 1964-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-13 | 1968-06-13 | 1968-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-13 | 1972-06-13 | 1972-12-13 | $7700.00 | Window Closed / Lapsed |