Patent US2632811A successfully refreshed from Google Patents.
US2632811A
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US
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Telephone amplifying apparatus
Assignee: SOUGET
•
Filing: 1948-06-02
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Granted: 1953-03-24
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Expires: 1968-06-02
Abstract
No abstract record available.
Inventors
- 👤 Matthys L M Souget
- 👤 Norman L Chalfin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:43
CPC Classifications
H; H04; H04M; H04M9/00; H04M9/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1697007A
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US2005973A
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US2160829A
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US2214992A
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US2367110A
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US2381097A
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US2402341A
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US2501955A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-23 | 1956-09-22 | 1957-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-23 | 1960-09-22 | 1961-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-23 | 1964-09-22 | 1965-03-24 | $7700.00 | Window Closed / Lapsed |