Patent US3409743A successfully refreshed from Google Patents.
US3409743A
Expired / Lapsed
US
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System for changing signal duration with reproduction frequency compensation
Assignee: US Philips Corp
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Filing: 1965-04-16
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Granted: 1968-11-05
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Expires: 1985-04-16
Abstract
No abstract record available.
Inventors
- 👤 Greefkes Johannes Anton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:21
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/68; G; G11; G11B; G11B27/00; G11B27/005; G11B27/10; G11B5/00; H04B1/66; H04B1/662
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
A SYSTEM FOR CHANGING THE TIME DURATION OF A SIGNAL COMPRISING A SOURCE OF INPUT SIGNALS, AN OUTPUT CIRCUIT, A SERIES CIRCUIT COMPRISING MODULATOR MEANS AND DEMODULATOR MEANS CONNECTED IN THAT ORDER BETWEEN SAID SOURCE AND OUTPUT CIRCUIT, STORAGE SYSTEM MEANS COMPRISING INFORMATION STORAGE MEANS FOR RECORDING INFORMATION SIGNALS ON SAID STORAGE MEANS AT A FIRST PREDETERMINED RATE, AND MEANS FOR REPRODUCING INFORMATION SIGNALS FROM SAID STORAGE MEANS AT A SECOND PREDETERMINED RATE, AND MEANS FOR CONNECTING SAID STORAGE SYSTEM MEANS IN SERIES IN SAID SERIES CIRCUIT, SAID MODULATOR MEANS COMPRISING A SOURCE OF FIRST OSCILLATIONS AND SINGLE SIDEBAND MODULATOR MEANS FOR MODULATING SAID SIGNALS WITH SAID FIRST OSCILLATIONS TO PRODUCE A SINGLE SIDEBAND SIGNAL, SAID DEMODULATOR MEANS COMPRISING A SOURCE OF SECOND OSCILLATIONS WITH MIXING MEANS FOR MIXING SAID SECOND OSCILLATIONS WITH SAID SINGLE SIDEBAND SIGNAL TO PRODUCE AN OUTPPUT SIGNAL, THE FREQUENCY OF SAID SECOND OSCILLATIONS BEING SHIFTED WITH RESPECT TO THE FREQUENCY OF SAID FIRST OSCILLATIONS WHEREBY INPUT SIGNALS OF A PREDETERMINED FREQUENCY CORRESPOND TO OUTPUT SIGNALS OF THE SAME FREQUENCY.
Claim 2
Independent Claim
174 words
A SYSTEM FOR CHANGING THE TIME DURATION OF A SIGNAL COMPRISING A SOURCE OF INPUT SIGNALS, AN OUTPUT CIRCUIT, A SERIES CIRCUIT COMPRISING MODULATOR MEANS AND DEMODULATOR MEANS CONNECTED IN THAT ORDER BETWEEN SAID SOURCE AND OUTPUT CIRCUIT, STORAGE SYSTEM MEANS COMPRISING INFORMATION STORAGE MEANS FOR RECORDING INFORMATION SIGNALS ON SAID STORAGE MEANS AT A FIRST PREDETERMINED RATE, AND MEANS FOR REPRODUCING INFORMATION SIGNALS FROM SAID STORAGE MEANS AT A SECOND PREDETERMINED RATE, AND MEANS FOR CONNECTING SAID STORAGE SYSTEM MEANS IN SERIES IN SAID SERIES CIRCUIT, SAID MODULATOR MEANS COMPRISING A SOURCE OF FIRST OSCILLATIONS AND SINGLE SIDEBAND MODULATOR MEANS FOR MODULATING SAID SIGNALS WITH SAID FIRST OSCILLATIONS TO PRODUCE A SINGLE SIDEBAND SIGNAL, SAID DEMODULATOR MEANS COMPRISING A SOURCE OF SECOND OSCILLATIONS WITH MIXING MEANS FOR MIXING SAID SECOND OSCILLATIONS WITH SAID SINGLE SIDEBAND SIGNAL TO PRODUCE AN OUTPPUT SIGNAL, THE FREQUENCY OF SAID SECOND OSCILLATIONS BEING SHIFTED WITH RESPECT TO THE FREQUENCY OF SAID FIRST OSCILLATIONS WHEREBY INPUT SIGNALS OF A PREDETERMINED FREQUENCY CORRESPOND TO OUTPUT SIGNALS OF THE SAME FREQUENCY.
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) | 1971-11-05 | 1972-05-06 | 1972-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-05 | 1976-05-06 | 1976-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-05 | 1980-05-06 | 1980-11-05 | $7700.00 | Window Closed / Lapsed |