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Patent US2657265A successfully refreshed from Google Patents.
US2657265A
Expired / Lapsed
US
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Amplifying device for use with telephone apparatus
Assignee: Individual
•
Filing: 1950-10-24
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Granted: 1953-10-27
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Expires: 1970-10-24
Abstract
No abstract record available.
Inventors
- 👤 Branson John Charles Sydney
- 👤 Branson Leslie Clifford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:00
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M1/21; H04M1/215
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1298217A
Cited
US1654193A
Cited
US2214992A
Cited
US2501955A
Cited
US2500264A
Cited
US2528636A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-26 | 1957-04-27 | 1957-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-26 | 1961-04-27 | 1961-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-26 | 1965-04-27 | 1965-10-27 | $7700.00 | Window Closed / Lapsed |