Patent US3218395A successfully refreshed from Google Patents.
US3218395A
Expired / Lapsed
US
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Electronic signaling arrangement
Assignee: Automatic Electric Laboratories Inc
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Filing: 1962-09-17
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Granted: 1965-11-16
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Expires: 1982-09-17
Abstract
No abstract record available.
Inventors
- 👤 Douglas J Suda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:38
CPC Classifications
H; H04; H04M; H04M19/00; H04M19/02; H04M19/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
IN A TELEPHONE SYSTEM INCLUDING A CENTRAL OFFICE HAVING A SOURCE OF ALTERNATING SIGNALING CURRENT, A SUBSCRIBER LINE, AND A TONE SIGNAL GENERATOR CONNECTED TO SAID LINE, SAID TONE SIGNAL GENERATOR COMPRISING: AN OSCILLATOR HAVING AN INPUT CIRCUIT AND AN OUTPUT CIRCUIT, SAID OUTPUT CIRCUIT INCLUDING A SOUND TRANSDUCER; BRIDGE RECTIFIER MEANS FOR SUPPLYING SAID OSCILLATOR WITH DIRECT CURRENT OPERATING POTENTIALS, SAID RECTIFIER HAVING A PLURALITY OF INPUT TERMINALS AND A PLURALITY OF OUTPUT TERMINALS; AND MEANS INCLUDING AN ALTERNATING CURRENT VOLTAGE DIVIDING CIRCUIT INTERPOSED BETWEEN ONE OF SAID RECTIFIER INPUT TERMINALS AND SAID INPUT CIRCUIT OF SAID OSCILLATOR FOR DERIVING AN OPERATING BIAS FOR SAID OSCILLATOR DURING ALTERNATE HALF CYCLES OF SAID ALTERNATING CURRENT.
Claim 2
Dependent Claim
115 words
IN A TELEPHONE SYSTEM INCLUDING A CENTRAL OFFICE HAVING A SOURCE OF ALTERNATING SIGNALING CURRENT, A SUBSCRIBER LINE, AND A TONE SIGNAL GENERATOR CONNECTED TO SAID LINE, SAID TONE SIGNAL GENERATOR COMPRISING: AN OSCILLATOR HAVING AN INPUT CIRCUIT AND AN OUTPUT CIRCUIT, SAID OUTPUT CIRCUIT INCLUDING A SOUND TRANSDUCER; BRIDGE RECTIFIER MEANS FOR SUPPLYING SAID OSCILLATOR WITH DIRECT CURRENT OPERATING POTENTIALS, SAID RECTIFIER HAVING A PLURALITY OF INPUT TERMINALS AND A PLURALITY OF OUTPUT TERMINALS; AND MEANS INCLUDING AN ALTERNATING CURRENT VOLTAGE DIVIDING CIRCUIT INTERPOSED BETWEEN ONE OF SAID RECTIFIER INPUT TERMINALS AND SAID INPUT CIRCUIT OF SAID OSCILLATOR FOR DERIVING AN OPERATING BIAS FOR SAID OSCILLATOR DURING ALTERNATE HALF CYCLES OF SAID ALTERNATING CURRENT.
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) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |