US3315039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone signaling conversion circuit for pulses and tones
Assignee: AT&T Inc
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Filing: 1963-09-30
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Granted: 1967-04-18
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Expires: 1983-09-30
Abstract
No abstract record available.
Inventors
- 👤 Robert C Gebhardt
- 👤 Jr Albert E Spencer
- 👤 Terry A Taebel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:03
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A TRANSMISSION CIRCUIT COMPRISING A TRANSFORMER HAVING THREE INDUCTIVELY COUPLED WINDINGS, A PLURALITY OF TELEPHONE LINES CONNECTED THROUGH A TIME DIVISION SWITCHING NETWORK TO A FIRST ONE OF SAID WINDINGS, A TRUNK CONNECTED TO A SECOND ONE OF SAID WINDINGS, A TONE OSCILLATOR CONNECTED TO THE THIRD ONE OF SAID WINDINGS, MEANS CONNECTED TO SAID FIRST WINDINGS FOR TURNING ON SAID TONE OSCILLATOR FOR A PREDETERMINED TIME INTERVAL IN RESPONSE TO RECEIPT IN SAID FIRST WINDING OF ROTARY DIAL PULSES APPEARING ON SAID LINE, AND MEANS FOR INHIBITING THE OPERATION OF SAID TONE OSCILLATOR RESPONSIVE TO THE RECEIPT IN SAID FIRST WINDING OF TONE BURSTS APPEARING ON SAID LINE.
Claim 2
Dependent Claim
109 words
A TRANSMISSION CIRCUIT COMPRISING A TRANSFORMER HAVING THREE INDUCTIVELY COUPLED WINDINGS, A PLURALITY OF TELEPHONE LINES CONNECTED THROUGH A TIME DIVISION SWITCHING NETWORK TO A FIRST ONE OF SAID WINDINGS, A TRUNK CONNECTED TO A SECOND ONE OF SAID WINDINGS, A TONE OSCILLATOR CONNECTED TO THE THIRD ONE OF SAID WINDINGS, MEANS CONNECTED TO SAID FIRST WINDINGS FOR TURNING ON SAID TONE OSCILLATOR FOR A PREDETERMINED TIME INTERVAL IN RESPONSE TO RECEIPT IN SAID FIRST WINDING OF ROTARY DIAL PULSES APPEARING ON SAID LINE, AND MEANS FOR INHIBITING THE OPERATION OF SAID TONE OSCILLATOR RESPONSIVE TO THE RECEIPT IN SAID FIRST WINDING OF TONE BURSTS APPEARING ON SAID LINE.
References Cited (Backward Citations)
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Cited
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Cited
US3205312A
Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-04-17 | 1970-10-17 | 1971-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-17 | 1974-10-17 | 1975-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-17 | 1978-10-17 | 1979-04-18 | $7700.00 | Window Closed / Lapsed |