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US3559104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wideband crystal-controlled fm modulator having noise cancelling feedback
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1968-08-26
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Granted: 1971-01-26
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Expires: 1988-08-26
Abstract
Abstract A CRYSTAL-CONTROLLED OSCILLATOR IS PROVIDED WITH A FEEDBACK PATH FOR SUBSTANTIALLY CANCELLING ANY DISTORTION, SPURIOUS CRYSTAL MODES OR OTHER NOISE THAT MAY APPEAR IN THE OSCILLATOR OUTPUT. TO THIS END THE FEEDBACK PATH INCLUDES AN FM DEMODULATOR FOR EXTRACTING THE BASEBAND SIGNAL AND ANY DISTORTION WHICH MAY EXIST. THE FEEDBACK PATH INCLUDES AN ALLDER FOR COMPARING THE INPUT SIGNAL WITH THE MODULATION SIGNAL. PREFERABLY, THE PHASES AND AMPLITUDE OF BOTH INPUT AND DEMODULATED SIGNAL ARE ADJUSTED TO BE EQUAL.
Inventors
- 👤 Harrison Y Miyahira
- 👤 John L Wilkerson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:00
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/10; H03C3/12; H03C3/22; H03C3/222
Claims Analysis
Total Claims: 0
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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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |