US2815823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loudspeaker structure
Assignee: RCA Corp
•
Filing: 1953-03-02
•
Granted: 1957-12-10
•
Expires: 1973-03-02
Abstract
No abstract record available.
Inventors
- 👤 Harry F Olson
- 👤 Preston John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:57
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/24; H04R9/00; H04R9/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1298290A
Cited
US1781387A
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US1743767A
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US1829355A
Cited
GB400825A
Cited
US1990409A
Cited
US2071829A
Cited
FR835518A
Cited
US2269284A
Cited
US2426948A
Cited
US2657758A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-09 | 1961-06-10 | 1961-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-09 | 1965-06-10 | 1965-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-09 | 1969-06-10 | 1969-12-10 | $7700.00 | Window Closed / Lapsed |