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 10:16
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/60; H04M1/62
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1432623A
Cited
US1941237A
Cited
US1944701A
Cited
US2157140A
Cited
GB489115A
Cited
US2191993A
Cited
US2224698A
Cited
US2177769A
Cited
US2277907A
Cited
US2269565A
Cited
US2405543A
Cited
US2385279A
Cited
US2369144A
Cited
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 |