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US2427844A
Expired / Lapsed
US
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Vibratory unit for electrodynamic loud-speakers
Assignee: Gylling and Co AB
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Filing: 1944-04-12
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Granted: 1947-09-23
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Expires: 1964-04-12
Abstract
No abstract record available.
Inventors
- 👤 Eklov David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:15
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/16; H04R7/02; H04R7/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1215500A
Cited
US1573739A
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US1630380A
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US1957562A
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US1961286A
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US2070977A
Cited
US2347799A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-09-22 | 1951-03-24 | 1951-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-09-22 | 1955-03-24 | 1955-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-09-22 | 1959-03-24 | 1959-09-23 | $7700.00 | Window Closed / Lapsed |