US2666650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound pickup and reproducing apparatus
Assignee: Individual
•
Filing: 1951-02-07
•
Granted: 1954-01-19
•
Expires: 1971-02-07
Abstract
No abstract record available.
Inventors
- 👤 Macdonell John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:46
CPC Classifications
G; G11; G11B; G11B7/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1812687A
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US1918422A
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US1897222A
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US1899994A
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US1881146A
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US2039104A
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US2085194A
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US2173994A
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US2259511A
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US2249606A
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US2354295A
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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) | 1957-01-18 | 1957-07-20 | 1958-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-18 | 1961-07-20 | 1962-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-18 | 1965-07-20 | 1966-01-19 | $7700.00 | Window Closed / Lapsed |