US2640556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loud-speaker diaphragm and mounting
Assignee: Individual
•
Filing: 1947-07-25
•
Granted: 1953-06-02
•
Expires: 1967-07-25
Abstract
No abstract record available.
Inventors
- 👤 Joseph B Brennan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:34
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; H04R7/04; H04R7/06; H04R7/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2087441A
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US2336797A
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US2357392A
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US2372433A
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US2459804A
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US2490466A
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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) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |