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Patent US2568883A successfully refreshed from Google Patents.
US2568883A
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Loud-speaker with expanding horn unit
Assignee: Altec Lansing Corp
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Filing: 1947-03-24
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Granted: 1951-09-25
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Expires: 1967-03-24
Abstract
No abstract record available.
Inventors
- 👤 George L Carrington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:38
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)
US1869665A
Cited
US1917012A
Cited
US2194070A
Cited
US2269284A
Cited
US2231479A
Cited
US2371951A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-24 | 1955-03-26 | 1955-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-24 | 1959-03-26 | 1959-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-24 | 1963-03-26 | 1963-09-25 | $7700.00 | Window Closed / Lapsed |