US2506715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loud-speaking telephone station set with separate acoustic passages to the receiver and transmitter
Assignee: Automatic Electric Laboratories Inc
•
Filing: 1947-08-22
•
Granted: 1950-05-09
•
Expires: 1967-08-22
Abstract
No abstract record available.
Inventors
- 👤 Charles F Ffolliott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:26
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/60; H04M1/62
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1941237A
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US1944701A
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US2157140A
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GB489115A
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US2191993A
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US2224698A
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US2177769A
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US2277907A
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US2269565A
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US2405543A
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US2385279A
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US2369144A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-08 | 1953-11-07 | 1954-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-08 | 1957-11-07 | 1958-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-08 | 1961-11-07 | 1962-05-09 | $7700.00 | Window Closed / Lapsed |