Patent US2542922A successfully refreshed from Google Patents.
US2542922A
Expired / Lapsed
US
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Loud speaking telephine instrument
Assignee: Automatic Electric Laboratories Inc
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Filing: 1946-12-13
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Granted: 1951-02-20
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Expires: 1966-12-13
Abstract
No abstract record available.
Inventors
- 👤 Gabriel M Giannini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:59
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/60; H04M1/62
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1432623A
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US2063224A
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US2214992A
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US2218389A
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GB508031A
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US2272474A
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US2177769A
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US2341539A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-19 | 1954-08-21 | 1955-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-19 | 1958-08-21 | 1959-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-19 | 1962-08-21 | 1963-02-20 | $7700.00 | Window Closed / Lapsed |