US3213367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal transmission systems employing angle modulation
Assignee: Post Office
•
Filing: 1962-02-02
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Granted: 1965-10-19
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Expires: 1982-02-02
Abstract
No abstract record available.
Inventors
- 👤 Ravenscroft Ivor Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:46
CPC Classifications
H; H04; H04J; H04J1/00; H04J1/20; H04B; H04B14/00; H04B14/002; H04B14/006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A FREQUENCY MODULATED TRANSMISSION SYSTEM COMPRISING, IN COMBINATION: A TRANSMITTING APPARATUS INCLUDING AN ANGLE MODULATED OSCILLATOR, ATTENUATOR MEANS IN SAID TRANSMITTING APPARATUS FOR ATTENUATING THE CENTER CARRIER FREQUENCY TO REDUCE THE AMPLITUDE THEREOF RELATIVE TO THE AMPLITUDE OF THE SIDE BAND FREQUENCIES; A RECEIVING APPARATUS FOR RECEIVING SIGNALS TRANSMITTING APPARATUS AND SAID RECEIVER APPARATUS INCLUDING MEANS FOR INCREASING THE AMPLITUDE OF THE CENTER CARRIER FREQUENCY TO RESTORE THE RELATION BETWEEN THE AMPLITUDE OF THE CARRIER FREQUENCY AND OF THE SIDE BAND FREQUENCIES TO THAT PERTAINING BEOFRE CARRIER REDUCTION IN THE TRANSMITTING APPARATUS.
Claim 2
Dependent Claim
92 words
A FREQUENCY MODULATED TRANSMISSION SYSTEM COMPRISING, IN COMBINATION: A TRANSMITTING APPARATUS INCLUDING AN ANGLE MODULATED OSCILLATOR, ATTENUATOR MEANS IN SAID TRANSMITTING APPARATUS FOR ATTENUATING THE CENTER CARRIER FREQUENCY TO REDUCE THE AMPLITUDE THEREOF RELATIVE TO THE AMPLITUDE OF THE SIDE BAND FREQUENCIES; A RECEIVING APPARATUS FOR RECEIVING SIGNALS TRANSMITTING APPARATUS AND SAID RECEIVER APPARATUS INCLUDING MEANS FOR INCREASING THE AMPLITUDE OF THE CENTER CARRIER FREQUENCY TO RESTORE THE RELATION BETWEEN THE AMPLITUDE OF THE CARRIER FREQUENCY AND OF THE SIDE BAND FREQUENCIES TO THAT PERTAINING BEOFRE CARRIER REDUCTION IN THE TRANSMITTING APPARATUS.
References Cited (Backward Citations)
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US2575047A
Cited
US2738380A
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Cited
US2945212A
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US2907831A
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US3042867A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-18 | 1969-04-19 | 1969-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-18 | 1973-04-19 | 1973-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-18 | 1977-04-19 | 1977-10-19 | $7700.00 | Window Closed / Lapsed |