Patent US3287664A successfully refreshed from Google Patents.
US3287664A
Expired / Lapsed
US
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Heterodyne modulator using a minimum of transistors
Assignee: Ampex Corp
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Filing: 1964-04-08
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Granted: 1966-11-22
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Expires: 1984-04-08
Abstract
No abstract record available.
Inventors
- 👤 Michael O Felix
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:18
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/10; H03C3/12; H03C3/22; H03C3/222; H03C1/00; H03C1/52; H03C1/54; H03C1/56; H03C1/58; H04; H04N; H04N5/00; H04N5/38; H04N5/40; H04N5/76; H04N5/91; H04N5/92
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A MODULATOR CIRCUIT HAVING A SOURCE OF MODULATING SIGNALS, AN OUTPUT, A FIRST CARRIER OSCILLATOR HAVING A TIME CONSTANT DETERMINING NETWORK, FILTERING MEANS COUPLING SAID MODULATING SIGNAL SOURCE TO SAID TIME CONSTANT DETERMINATING NETWORK SUCH THAT MODULATED CARRIER OUTPUT SIGNALS FROM SAID CARRIER OSCILLATOR CANNOT PASS FORWARD TO THE MODULATING SIGNAL SOURCE, MEANS FOR PREVENTING THE MODULATING SIGNAL FROM APPEARING IN THE OUTPUT OF THE CARRIER OSCILLATOR, A SECOND CARRIER OSCILLATOR, AND MEANS FOR MIXING THE SIGNAL FROM THE SECOND CARRIER OSCILLATOR WITH THE SIGNAL FROM THE FIRST CARRIER OSCILLATOR, SAID MIXING MEANS BEING COUPLED TO THE OUTPUT.
Claim 2
Dependent Claim
98 words
A MODULATOR CIRCUIT HAVING A SOURCE OF MODULATING SIGNALS, AN OUTPUT, A FIRST CARRIER OSCILLATOR HAVING A TIME CONSTANT DETERMINING NETWORK, FILTERING MEANS COUPLING SAID MODULATING SIGNAL SOURCE TO SAID TIME CONSTANT DETERMINATING NETWORK SUCH THAT MODULATED CARRIER OUTPUT SIGNALS FROM SAID CARRIER OSCILLATOR CANNOT PASS FORWARD TO THE MODULATING SIGNAL SOURCE, MEANS FOR PREVENTING THE MODULATING SIGNAL FROM APPEARING IN THE OUTPUT OF THE CARRIER OSCILLATOR, A SECOND CARRIER OSCILLATOR, AND MEANS FOR MIXING THE SIGNAL FROM THE SECOND CARRIER OSCILLATOR WITH THE SIGNAL FROM THE FIRST CARRIER OSCILLATOR, SAID MIXING MEANS BEING COUPLED TO THE OUTPUT.
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) | 1969-11-21 | 1970-05-23 | 1970-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-21 | 1974-05-23 | 1974-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-21 | 1978-05-23 | 1978-11-22 | $7700.00 | Window Closed / Lapsed |