US3238463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronous demodulator circuit
Assignee: NEC Corp
•
Filing: 1963-09-16
•
Granted: 1966-03-01
•
Expires: 1983-09-16
Abstract
No abstract record available.
Inventors
- 👤 Inaba Masao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:54
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/66; H03; H03D; H03D1/00; H03D1/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A DEMODULATING CIRCUIT COMPRISING A SERIES CIRCUIT OF AT LEAST TWO IMPEDANCE ELEMENTS, MEANS FOR APPLYING A FIRST SIGNAL ACROSS SAID SERIES CIRCUIT, SAID FIRST SIGNAL BEING A MODULATED CARRIER SIGNAL, MEANS FOR APPLYING A SECOND SIGNAL TO AT LEAST ONE OF SAID SERIES CONNECTED IMPEDANCE ELEMENTS TO CAUSE THE IMPEDANCE THEREOF TO VARY IN A NON-LINEAR MANNER, AND THE MEANS FOR DERIVING FROM ACROSS ONE OF SAID SERIES CONNECTED IMPEDANCE ELEMENTS A SIGNAL VOLTAGE, SAID SIGNAL VOLTAGE BEING SUBSTANTIALLY PROPORTIONAL TO THE PRODUCT OF SAID FIRST AND SECOND SIGNALS.
Claim 2
Dependent Claim
90 words
A DEMODULATING CIRCUIT COMPRISING A SERIES CIRCUIT OF AT LEAST TWO IMPEDANCE ELEMENTS, MEANS FOR APPLYING A FIRST SIGNAL ACROSS SAID SERIES CIRCUIT, SAID FIRST SIGNAL BEING A MODULATED CARRIER SIGNAL, MEANS FOR APPLYING A SECOND SIGNAL TO AT LEAST ONE OF SAID SERIES CONNECTED IMPEDANCE ELEMENTS TO CAUSE THE IMPEDANCE THEREOF TO VARY IN A NON-LINEAR MANNER, AND THE MEANS FOR DERIVING FROM ACROSS ONE OF SAID SERIES CONNECTED IMPEDANCE ELEMENTS A SIGNAL VOLTAGE, SAID SIGNAL VOLTAGE BEING SUBSTANTIALLY PROPORTIONAL TO THE PRODUCT OF SAID FIRST AND SECOND SIGNALS.
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) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |