US2657758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loud-speaker
Assignee: Individual
•
Filing: 1950-03-24
•
Granted: 1953-11-03
•
Expires: 1970-03-24
Abstract
No abstract record available.
Inventors
- 👤 Varnet Pierre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:24
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/02; H04R9/04; H04R9/045
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US804903A
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US1040294A
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US1624357A
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US1722805A
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US1825833A
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US1846937A
Cited
US1941476A
Cited
FR738415A
Cited
US1956826A
Cited
US2030501A
Cited
US2288832A
Cited
US2531634A
Cited
US2512323A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-02 | 1957-05-04 | 1957-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-02 | 1961-05-04 | 1961-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-02 | 1965-05-04 | 1965-11-03 | $7700.00 | Window Closed / Lapsed |