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Patent US3307112A successfully refreshed from Google Patents.
US3307112A
Expired / Lapsed
US
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Demodulator circuits for frequency modulated electrical signals
Assignee: British Telecommunications PLC
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Filing: 1962-12-13
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Granted: 1967-02-28
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Expires: 1982-12-13
Abstract
No abstract record available.
Inventors
- 👤 Clark Adrian Percy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:43
CPC Classifications
H; H03; H03D; H03D3/00; H03D3/02; H03D3/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
IN A DEMODULATING ARRANGEMENT FOR A SIGNALLING SYSTEM HAVING BINARY INFORMATION TRANSMITTED BY FREQUENCY MODULATION, A TERMINAL FOR RECEIVING AN INCOMING SIGNAL WAVEFORM, MEANS FOR SLICING SAID INCOMING SIGNAL WAVEFORM SO AS TO PRODUCE A SQUARED WAVEFORM, A FIRST CAPACITOR MEANS CONTROLLED BY SAID SQUARED WAVEFORM FOR CHARGING SAID FIRST CAPACITOR AT A SUBSTANTIALLY UNIFORM RATE FOR THE PERIOD BETWEEN SUCCESSIVE TRANSITIONS OF SAID SQUARED WAVEFORM AND RESETTING IT TO ITS INITIAL STATE OF CHARGE AT THE END OF EACH SUCH PERIOD, A SECOND CAPACITOR, MEANS ASSOCIATED WITH SAID FIRST CAPACITOR FOR CHARGING SAID SECOND CAPACITOR AT A SUBSTANTIALLY UNIFORM RATE FROM THE OCCURRENCE OF ONE OF SAID TRANSITIONS FOR A PERIOD DEPENDENT ON THE STATE OF CHARGE OF SAID FIRST CAPACITOR, MEANS ASSOCIATED WITH SAID FIRST CAPACITOR FOR THEREUPON
Claim 2
Dependent Claim
130 words
IN A DEMODULATING ARRANGEMENT FOR A SIGNALLING SYSTEM HAVING BINARY INFORMATION TRANSMITTED BY FREQUENCY MODULATION, A TERMINAL FOR RECEIVING AN INCOMING SIGNAL WAVEFORM, MEANS FOR SLICING SAID INCOMING SIGNAL WAVEFORM SO AS TO PRODUCE A SQUARED WAVEFORM, A FIRST CAPACITOR MEANS CONTROLLED BY SAID SQUARED WAVEFORM FOR CHARGING SAID FIRST CAPACITOR AT A SUBSTANTIALLY UNIFORM RATE FOR THE PERIOD BETWEEN SUCCESSIVE TRANSITIONS OF SAID SQUARED WAVEFORM AND RESETTING IT TO ITS INITIAL STATE OF CHARGE AT THE END OF EACH SUCH PERIOD, A SECOND CAPACITOR, MEANS ASSOCIATED WITH SAID FIRST CAPACITOR FOR CHARGING SAID SECOND CAPACITOR AT A SUBSTANTIALLY UNIFORM RATE FROM THE OCCURRENCE OF ONE OF SAID TRANSITIONS FOR A PERIOD DEPENDENT ON THE STATE OF CHARGE OF SAID FIRST CAPACITOR, MEANS ASSOCIATED WITH SAID FIRST CAPACITOR FOR THEREUPON
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) | 1970-02-27 | 1970-08-29 | 1971-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-27 | 1974-08-29 | 1975-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-27 | 1978-08-29 | 1979-02-28 | $7700.00 | Window Closed / Lapsed |