US3264413A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fm stereophonic receiver using an insulated-gate-field-effect transistor for combining the subcarrier and composite waves
Assignee: RCA Corp
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Filing: 1963-04-01
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Granted: 1966-08-02
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Expires: 1983-04-01
Abstract
No abstract record available.
Inventors
- 👤 James F Merritt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:59
CPC Classifications
H; H03; H03D; H03D1/00; H03D1/22; H03D1/2209; H03D1/2218
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
MEANS FOR PRODUCING A CARRIER WAVE WHICH IS AMPLITUDE MODULATED IN ONE POLARITY BY A FIRST AUDIO WAVE AND IN THE OPPOSITE POLARITY BY SECOND AUDIO WAVE COMPRISING, AN AMPLIFIER HAVING A FIRST INPUT ELECTRODE, A SECOND INPUT ELECTRODE, AND AN OUTPUT ELECTRODE, MEANS FOR APPLYING TO SAID FIRST INPUT ELECTRODE A COMPOSITE WAVE COMPRISING AN AUDIO WAVE REPRESENTING THE SUM OF SAID FIRST AND SECOND AUDIO WAVES, THE SUPPRESSED CARRIER BALANCED MODULATION PRODUCTS OF A CARRIER WAVE AND AN AUDIO WAVE REPRESENTING THE DIFFERENCE OF SAID FIRST AND SECOND AUDIO WAVES, AND A PILOT WAVE, MEANS FOR SELECTING SAID PILOT WAVE FROM THE AMPLIFIED WAVES APPEARING AT THE OUTPUT ELECTRODE OF SAID AMPLIFIER, MEANS FOR CHANGING THE FREQUENCY OF SAID PILOT WAVE TO THE FREQUENCY OF SAID SUPPRESSED CARRIER WAVE, MEANS FOR APPLYING SAID FREQUENCY CHANGED WAVE TO SAID SECOND INPUT ELECTRODE FOR AMPLIFICATION BY SAID AMPLIFIER AND FOR COMBINATION WITH SAID COMPOSITIVE WAVE, AND MEANS FOR DERIVING SAID PRODUCED WAVE FROM SAID AMPLIFIER.
Claim 2
Dependent Claim
165 words
MEANS FOR PRODUCING A CARRIER WAVE WHICH IS AMPLITUDE MODULATED IN ONE POLARITY BY A FIRST AUDIO WAVE AND IN THE OPPOSITE POLARITY BY SECOND AUDIO WAVE COMPRISING, AN AMPLIFIER HAVING A FIRST INPUT ELECTRODE, A SECOND INPUT ELECTRODE, AND AN OUTPUT ELECTRODE, MEANS FOR APPLYING TO SAID FIRST INPUT ELECTRODE A COMPOSITE WAVE COMPRISING AN AUDIO WAVE REPRESENTING THE SUM OF SAID FIRST AND SECOND AUDIO WAVES, THE SUPPRESSED CARRIER BALANCED MODULATION PRODUCTS OF A CARRIER WAVE AND AN AUDIO WAVE REPRESENTING THE DIFFERENCE OF SAID FIRST AND SECOND AUDIO WAVES, AND A PILOT WAVE, MEANS FOR SELECTING SAID PILOT WAVE FROM THE AMPLIFIED WAVES APPEARING AT THE OUTPUT ELECTRODE OF SAID AMPLIFIER, MEANS FOR CHANGING THE FREQUENCY OF SAID PILOT WAVE TO THE FREQUENCY OF SAID SUPPRESSED CARRIER WAVE, MEANS FOR APPLYING SAID FREQUENCY CHANGED WAVE TO SAID SECOND INPUT ELECTRODE FOR AMPLIFICATION BY SAID AMPLIFIER AND FOR COMBINATION WITH SAID COMPOSITIVE WAVE, AND MEANS FOR DERIVING SAID PRODUCED WAVE FROM SAID AMPLIFIER.
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) | 1969-08-01 | 1970-01-31 | 1970-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-01 | 1974-01-31 | 1974-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-01 | 1978-01-31 | 1978-08-02 | $7700.00 | Window Closed / Lapsed |