Patent EP0006263A1 successfully refreshed from Google Patents.
US3353099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double-sideband communication system
Assignee: Toshiba Corp
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Filing: 1964-03-30
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Granted: 1967-11-14
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Expires: 1984-03-30
Abstract
No abstract record available.
Inventors
- 👤 Hayasi Syuiti
- 👤 Murakami Junzo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:10
CPC Classifications
H; H03; H03F; H03F7/00; H04; H04B; H04B1/00; H04B1/68; H04B14/00; H04B14/002; H04B14/006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A DOUBLE-SIDEBAND RADIO COMMUNICATION SYSTEM UTILIZING A PARAMETRIC AMPLIFIER COMPRISING, MEANS TO PRODUCE AND TRANSMIT A DOUBLE-SIDEBAND SIGNAL WHICH HAS A PAIR OF SIDEBANDS AND A CARRIER WAVE SIGNAL, THE PHASE OF THE CARRIER WAVE SIGNAL BEING SHIFTED SUBSTANTIALLY TO A PHASE ANGLE OF 90* FROM ITS NORMAL PHASE RELATION WITH RESPECT TO SAID SIDEBANDS; MEANS TO RECEIVE SAID DOUBLE-SIDEBAND SIGNAL AND AMPLIFY THE SAME BY MEANS OF A PARAMETRIC AMPLIFIER, MEANS TO SEPARATE SAID CARRIER WAVE SIGNAL FROM THE AMPLIFIED RECEIVED SIGNAL; AN AUTOMATIC PHASE CONTROL DEVICE TO ATTAIN PHASE SYNCHRONISM BY THE SEPARATED CARRIER WAVE SIGNAL; AN OSCILLATOR CONTROLLED BY MEANS OF SAID DEVICE; AND, MEANS TO DRIVE SAID PARAMETRIC AMPLIFIERS WITH THE OUTPUT OF SAID OSCILLATOR SO AS TO SEPARATE THE CARRIER WAVE SIGNAL AFTER THE RECEIVED SIGNAL HAS BEEN AMPLIFIED.
Claim 2
Dependent Claim
134 words
A DOUBLE-SIDEBAND RADIO COMMUNICATION SYSTEM UTILIZING A PARAMETRIC AMPLIFIER COMPRISING, MEANS TO PRODUCE AND TRANSMIT A DOUBLE-SIDEBAND SIGNAL WHICH HAS A PAIR OF SIDEBANDS AND A CARRIER WAVE SIGNAL, THE PHASE OF THE CARRIER WAVE SIGNAL BEING SHIFTED SUBSTANTIALLY TO A PHASE ANGLE OF 90* FROM ITS NORMAL PHASE RELATION WITH RESPECT TO SAID SIDEBANDS; MEANS TO RECEIVE SAID DOUBLE-SIDEBAND SIGNAL AND AMPLIFY THE SAME BY MEANS OF A PARAMETRIC AMPLIFIER, MEANS TO SEPARATE SAID CARRIER WAVE SIGNAL FROM THE AMPLIFIED RECEIVED SIGNAL; AN AUTOMATIC PHASE CONTROL DEVICE TO ATTAIN PHASE SYNCHRONISM BY THE SEPARATED CARRIER WAVE SIGNAL; AN OSCILLATOR CONTROLLED BY MEANS OF SAID DEVICE; AND, MEANS TO DRIVE SAID PARAMETRIC AMPLIFIERS WITH THE OUTPUT OF SAID OSCILLATOR SO AS TO SEPARATE THE CARRIER WAVE SIGNAL AFTER THE RECEIVED SIGNAL HAS BEEN AMPLIFIED.
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) | 1970-11-13 | 1971-05-15 | 1971-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-13 | 1975-05-15 | 1975-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-13 | 1979-05-15 | 1979-11-14 | $7700.00 | Window Closed / Lapsed |