US3124653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subcarrier
Assignee: —
•
Filing: —
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Granted: 1964-03-10
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Expires: 1981-03-10
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:25
CPC Classifications
H; H03; H03D; H03D1/00; H03D1/22; H03D1/2209; H03D1/2218
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
148 words
FOR A STEREOPHONIC FREQUENCY MODULATION RECEIVER INCLUDING MEANS TO PROVIDE A COMPOSITE SIGNAL INCLUDING MAIN CHANNEL AUDIO FREQUENCY COMPONENTS, A PILOT SIGNAL COMPONENT, AND SUBCARRIER SIDEBAND COMPONENTS, AN AMPLIFIER CIRCUIT FOR SEPARATING A PILOT SIGNAL COMPONENT FROM THE COMPOSITE SIGNAL COMPONENT INCLUDING AN AMPLIFYING DEVICE HAVING AN INPUT ELECTRODE AN OUTPUT ELECTRODE AND A COMMON ELECTRODE, AN INPUT CIRCUIT FOR SAID COMPOSITE SIGNAL COUPLED TO SAID INPUT ELECTRODE, A RESONANT CIRCUIT TUNED TO SAID PILOT SIGNAL COMPONENT COUPLED BETWEEN ONE OF SAID OUTPUT AND COMMON ELECTRODES AND A POINT OF REFERENCE POTENTIAL, A FIRST IMPEDANCE ELEMENT CONNECTED BETWEEN THE OTHER OF SAID OUTPUT AND COMMON ELECTRODES AND SAID POINT OF REFERENCE POTENTIAL, AND SECOND AND THIRD IMPEDANCE ELEMENTS CONNECTED BETWEEN SAID OUTPUT AND COMMON ELECTRODES, THE IMPEDANCE VALUES OF SAID IMPEDANCE ELEMENTS BEING SO RELATED THAT THE PILOT SIGNAL VOLTAGE AT THE JUNCTION THEREOF IS SUBSTANTIALLY BALANCED OUT.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-03-10 | 1967-09-09 | 1968-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-10 | 1971-09-09 | 1972-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-10 | 1975-09-09 | 1976-03-10 | $7700.00 | Window Closed / Lapsed |