US2630189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mounting of twin acoustic diaphragm assemblies
Assignee: Individual
•
Filing: 1948-11-19
•
Granted: 1953-03-03
•
Expires: 1968-11-19
Abstract
No abstract record available.
Inventors
- 👤 Julie Joel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:46
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; H04R7/12; H04R7/122
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1844657A
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US1984550A
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US1843367A
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US1844802A
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US2186576A
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US2269284A
Cited
US2329560A
Cited
US2439666A
Cited
US2490466A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-02 | 1956-09-01 | 1957-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-02 | 1960-09-01 | 1961-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-02 | 1964-09-01 | 1965-03-03 | $7700.00 | Window Closed / Lapsed |