US3391253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiparty ringing selection circuit
Assignee: AT&T Inc
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Filing: 1965-03-25
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Granted: 1968-07-02
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Expires: 1985-03-25
Abstract
No abstract record available.
Inventors
- 👤 John P Grandmaison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:12
CPC Classifications
H; H04; H04Q; H04Q5/00; H04Q5/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
83 words
IN A COMMUNICATION SYSTEM HAVING A PLURALITY OF MULTISTATION LINES, THE COMBINATION COMPRISING MEANS FOR APPLYING A FIRST CONTROL SIGNAL TO ONE OF SAID PLURALITY OF MULTISTATION LINES, A SIGNALING BUS CONNECTED TO SAID SIGNAL APPLYING MEANS AND INDIVIDUAL TO A STATION OF SAID ONE MULTISTATION LINE FOR TRANSMITTING A SECOND CONTROL SIGNAL, A SOURCE OF RINGING TONE, AND MEANS INDIVIDUAL TO SAID STATION RESPONSIVE TO RECEIPT OF SAID FIRST AND SECOND CONTROL SIGNALS FOR CONNECTING SAID RINGING TONE SOURCE OF SAID STATION.
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) | 1971-07-02 | 1972-01-01 | 1972-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-02 | 1976-01-01 | 1976-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-02 | 1980-01-01 | 1980-07-02 | $7700.00 | Window Closed / Lapsed |