Patent US3714378A successfully refreshed from Google Patents.
US3714378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Special service speech transfer equipment for telephone exchange systems
Assignee: Oki Electric Industry Co Ltd
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Filing: 1969-12-10
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Granted: 1973-01-30
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Expires: 1989-12-10
Abstract
Abstract A SPECIAL SERVICE SUBSCRIBER CIRCUIT ASSOCIATED WITH EACH SUBSCRIBER IS CONNECTED BY A LINK TO A COMMON SPECIAL SERVICE CIRCUIT. A SPEECH CONNECTION IS FORMED VIA THE SPEECH CONNECTION OF THE TELEPHONE SWITCHING EQUIPMENT THROUGH THE SPECIAL SERVICE SUBSCRIBER CIRCUIT BY DIVERTING THE SPEECH CONNECTION INTO THE SPECIAL SERVICE COMMON CIRCUIT FROM THE SPECIAL SERVICE SUBSCRIBER CIRCUIT THROUGH THE LINK BY FLASHING THE HOOK SWITCH OF THE SPECIAL SERVICE SUBSCRIBER. CALL WAITING AND HOLDING SERVICES ARE PROVIDED ON THE SPECIAL SERVICES SPEECH CONNECTIONS WHICH ARE DIFFERENT FROM THE NORMAL SPEECH CONNECTIONS.
Inventors
- 👤 Y Masuda
- 👤 T Yamagami
- 👤 Y Kimura
- 👤 Y Ariizumi
- 👤 Y Okita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:43
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |