Patent US2885478A successfully refreshed from Google Patents.
US2885478A
Expired / Lapsed
US
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Loudspeaking telephone employing transistors
Assignee: General Telephone Laboratories Inc
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Filing: 1957-03-20
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Granted: 1959-05-05
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Expires: 1977-03-20
Abstract
No abstract record available.
Inventors
- 👤 Gabriele F Cerofolini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:01
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/60; H04M1/62; H04M1/02; H04M1/6033; H04M19/00; H04M19/02; H04M19/04; H04M3/00; H04M3/60; H04M3/64
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-04 | 1962-11-03 | 1963-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-04 | 1966-11-03 | 1967-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-04 | 1970-11-03 | 1971-05-05 | $7700.00 | Window Closed / Lapsed |