Patent US3588720A successfully refreshed from Google Patents.
US3588720A
Expired / Lapsed
US
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Linear phase demodulator
Assignee: United States Department of the Navy
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Filing: 1969-03-05
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Granted: 1971-06-28
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Expires: 1989-03-05
Abstract
Abstract A PHASE DEMODULATOR INCLUDING A DUAL CHANNEL QUADRATURE PHASE MODULATOR FOR MODULATING AN INCOMING PHASE MODULATED SIGNAL, A FILTER IN EACH CHANNEL, A FREQUENCY MIXER FOR COMBINING THE PROCESSED SIGNALS FROM THE TWO CHANNELS, A FREQUENCY DISCRIMINATOR, AND AN INTEGRATOR. THE CIRCUIT DOUBLES THE PHASE ARGUMENT OF THE INPUT SIGNAL PRIOR TO DEMODULATION SO THAT THE RESOLUTION OF THE PHASE INFORMATION CAN BE INCREASED, AND THE ACCURACY ENHANCED.
Inventors
- 👤 Frederick R Fluhr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:52
CPC Classifications
H; H03; H03D; H03D3/00; H03D3/02
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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |