Patent US4669849A successfully refreshed from Google Patents.
Patent US2469773A successfully refreshed from Google Patents.
US2469773A
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Loud-speaker diaphragm support member
Assignee: JENSEN Manufacturing Co
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Filing: 1942-08-12
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Granted: 1949-05-10
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Expires: 1962-08-12
Abstract
No abstract record available.
Inventors
- 👤 Hugh S Knowles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:20
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/06; H04R1/00; H04R1/20; H04R1/22; H04R9/02; H04R9/022; H04R9/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1284222A
Cited
US2002190A
Cited
US1877294A
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US1831235A
Cited
GB351204A
Cited
US1886816A
Cited
US1893049A
Cited
US2090025A
Cited
US2261110A
Cited
US2261111A
Cited
US1997051A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-09 | 1952-11-08 | 1953-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-09 | 1956-11-08 | 1957-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-09 | 1960-11-08 | 1961-05-10 | $7700.00 | Window Closed / Lapsed |