US3440569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise reduction in frequency modulation system
Assignee: AT&T Inc
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Filing: 1966-09-29
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Granted: 1969-04-22
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Expires: 1986-09-29
Abstract
No abstract record available.
Inventors
- 👤 Paul T Hutchison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:00
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/02; H03C3/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A MODULATION SYSTEM FOR PRODUCING A GIVEN INTELLIGENCE BEARING FREQUENCY DEVIATION ABOUT A GIVEN CENTER FREQUENCY COMPRISING MEANS FOR DERIVING A CARRIER OF FREQUENCY N TIMES SAID CENTER FREQUENCY, MEANS FOR DEVIATING THE FREQUENCY OF SAID CARRIER N TIMES SAID GIVEN DEVIATION, AND MEANS FOR FREQUENCY DIVIDING SAID DEVIATED CARRIER BY N TO PRODUCE A SIGNAL HAVING SAID GIVEN DEVIATION AND CENTER FREQUENCY.
Claim 2
Dependent Claim
63 words
A MODULATION SYSTEM FOR PRODUCING A GIVEN INTELLIGENCE BEARING FREQUENCY DEVIATION ABOUT A GIVEN CENTER FREQUENCY COMPRISING MEANS FOR DERIVING A CARRIER OF FREQUENCY N TIMES SAID CENTER FREQUENCY, MEANS FOR DEVIATING THE FREQUENCY OF SAID CARRIER N TIMES SAID GIVEN DEVIATION, AND MEANS FOR FREQUENCY DIVIDING SAID DEVIATED CARRIER BY N TO PRODUCE A SIGNAL HAVING SAID GIVEN DEVIATION AND CENTER FREQUENCY.
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) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |