US3322902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone subscriber's line circuit
Assignee: AT&T Inc
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Filing: 1963-12-23
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Granted: 1967-05-30
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Expires: 1983-12-23
Abstract
No abstract record available.
Inventors
- 👤 Adam C Carney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:42
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
IN A COMMUNICATION SYSTEM, A SUBSCRIBER''S LINE COMPRISING A PAIR OF LINE CONDUCTORS, A SUBSCRIBER''S LINE CIRCUIT CONNECTED TO SAID LINE FOR DETECTING RINGING SIGNALS OVER SAID LINE CONDUCTORS, A POINT OF REFERENCE POTENTIAL, IMPEDANCE MEANS AT SAID LINE CIRCUIT INDIVIDUALLY CONNECTING EACH OF SAID LINE CONDUCTORS TO SAID POINT OF REFERENCE POTENTIAL, A DIFFERENCE GATING ARRANGEMENT HAVING TWO INPUTS AND AN OUTPUT, MEANS FOR INTERCONNECTING SAID IMPEDANCE MEANS AND SAID INPUTS OF SAID DIFFERENCE GATING ARRANGEMENT, AND MEANS CONNECTED TO SAID OUTPUT OF SAID DIFFERENCE GATING ARRANGEMENT FOR INITIATING LOCAL STATION RINGING.
Claim 2
Dependent Claim
93 words
IN A COMMUNICATION SYSTEM, A SUBSCRIBER''S LINE COMPRISING A PAIR OF LINE CONDUCTORS, A SUBSCRIBER''S LINE CIRCUIT CONNECTED TO SAID LINE FOR DETECTING RINGING SIGNALS OVER SAID LINE CONDUCTORS, A POINT OF REFERENCE POTENTIAL, IMPEDANCE MEANS AT SAID LINE CIRCUIT INDIVIDUALLY CONNECTING EACH OF SAID LINE CONDUCTORS TO SAID POINT OF REFERENCE POTENTIAL, A DIFFERENCE GATING ARRANGEMENT HAVING TWO INPUTS AND AN OUTPUT, MEANS FOR INTERCONNECTING SAID IMPEDANCE MEANS AND SAID INPUTS OF SAID DIFFERENCE GATING ARRANGEMENT, AND MEANS CONNECTED TO SAID OUTPUT OF SAID DIFFERENCE GATING ARRANGEMENT FOR INITIATING LOCAL STATION RINGING.
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) | 1970-05-29 | 1970-11-28 | 1971-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-29 | 1974-11-28 | 1975-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-29 | 1978-11-28 | 1979-05-30 | $7700.00 | Window Closed / Lapsed |