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US2509307A
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US
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Assignee: Individual
•
Filing: 1945-12-21
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Granted: 1950-05-30
•
Expires: 1965-12-21
Abstract
No abstract record available.
Inventors
- 👤 Frederick G Madera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:07
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/58; G11B3/5809; G11B3/5818; G11B3/5827; G11B3/5836; G11B3/5854; G11B3/5863
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US428273A
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US763903A
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US1516193A
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US1654713A
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US1896851A
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US2033273A
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US1992234A
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US2059263A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-29 | 1953-11-28 | 1954-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-29 | 1957-11-28 | 1958-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-29 | 1961-11-28 | 1962-05-30 | $7700.00 | Window Closed / Lapsed |