US3131352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmitting device
Assignee: US Philips Corp
•
Filing: 1960-11-14
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Granted: 1964-04-28
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Expires: 1980-11-14
Abstract
No abstract record available.
Inventors
- 👤 Ensink Johannes
- 👤 Beijnink Willem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:32
CPC Classifications
H; H04; H04J; H04J1/00; H04J1/02; H04J1/14; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A CARRIER FREQUENCY TELEPHONE TRANSMITTING SYSTEM COMPRISING A SOURCE OF SPEECH SIGNALS, A SOURCE OF CARRIER OSCILLATIONS, A SOURCE OF SIGNALLING OSCILLATIONS, MEANS FOR MODULATING SAID CARRIER OSCILLATIONS WITH SAID SPEECH SIGNALS, SIGNALLING GENERATOR MEANS FOR MODULATING SAID CARRIER OSCILLATIONS WITH SAID SIGNALLING OSCILLATIONS, AND MEANS FOR COMBINING THE SPEECH SIGNAL MODULATED CARRIER OSCILLATIONS AND THE SIGNALLING OSCILLATION MODULATED CARRIER OSCILLATIONS TO PROVIDE AN OUTPUT SIGNAL, SAID SIGNALLING GENERATOR COMPRISING A TRANSISTOR HAVING FIRST AND SECOND INPUT ELECTRODES AND A COLLECTOR ELECTRODE, A SOURCE OF BIAS VOLTAGE HAVING ONE TERMINAL CONNECTED TO A REFERENCE POINT AND A SECOND TERMINAL, FIRST AND SECOND RESISTIVE VOLTAGE DIVIDERS EACH CONNECTED BETWEEN SAID FIRST AND SECOND TERMINALS AND HAVING FIRST AND SECOND TAPS RESPECTIVELY CONNECTED TO SAID FIRST AND SECOND INPUT TERMINALS RESPECTIVELY, MEANS APPLYING SAID SIGNALLING OSCILLATIONS TO SAID SECOND INPUT ELECTRODE, MEANS APPLYING SAID CAR-
Claim 2
Dependent Claim
143 words
A CARRIER FREQUENCY TELEPHONE TRANSMITTING SYSTEM COMPRISING A SOURCE OF SPEECH SIGNALS, A SOURCE OF CARRIER OSCILLATIONS, A SOURCE OF SIGNALLING OSCILLATIONS, MEANS FOR MODULATING SAID CARRIER OSCILLATIONS WITH SAID SPEECH SIGNALS, SIGNALLING GENERATOR MEANS FOR MODULATING SAID CARRIER OSCILLATIONS WITH SAID SIGNALLING OSCILLATIONS, AND MEANS FOR COMBINING THE SPEECH SIGNAL MODULATED CARRIER OSCILLATIONS AND THE SIGNALLING OSCILLATION MODULATED CARRIER OSCILLATIONS TO PROVIDE AN OUTPUT SIGNAL, SAID SIGNALLING GENERATOR COMPRISING A TRANSISTOR HAVING FIRST AND SECOND INPUT ELECTRODES AND A COLLECTOR ELECTRODE, A SOURCE OF BIAS VOLTAGE HAVING ONE TERMINAL CONNECTED TO A REFERENCE POINT AND A SECOND TERMINAL, FIRST AND SECOND RESISTIVE VOLTAGE DIVIDERS EACH CONNECTED BETWEEN SAID FIRST AND SECOND TERMINALS AND HAVING FIRST AND SECOND TAPS RESPECTIVELY CONNECTED TO SAID FIRST AND SECOND INPUT TERMINALS RESPECTIVELY, MEANS APPLYING SAID SIGNALLING OSCILLATIONS TO SAID SECOND INPUT ELECTRODE, MEANS APPLYING SAID CAR-
References Cited (Backward Citations)
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US2215483A
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US2880312A
Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-28 | 1967-10-28 | 1968-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-28 | 1971-10-28 | 1972-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-28 | 1975-10-28 | 1976-04-28 | $7700.00 | Window Closed / Lapsed |