US201488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in speaking-telephones
Assignee: Individual
•
Filing: 1878-02-08
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Granted: 1878-03-19
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Expires: 1898-02-08
Abstract
No abstract record available.
Inventors
- 👤 Alexander Graham Bell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:34
CPC Classifications
H; H04; H04R; H04R11/00
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) | 1881-03-18 | 1881-09-17 | 1882-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1885-03-18 | 1885-09-17 | 1886-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1889-03-18 | 1889-09-17 | 1890-03-19 | $7700.00 | Window Closed / Lapsed |