Patent US728382A successfully refreshed from Google Patents.
US728382A
Expired / Lapsed
US
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Diaphragm for machines for recording of reproducing sound or speech.
Assignee: Individual
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Filing: 1899-05-23
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Granted: 1903-05-19
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Expires: 1919-05-23
Abstract
No abstract record available.
Inventors
- 👤 John C English
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:26
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; H04R7/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1906-05-18 | 1906-11-17 | 1907-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1910-05-18 | 1910-11-17 | 1911-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1914-05-18 | 1914-11-17 | 1915-05-19 | $7700.00 | Window Closed / Lapsed |