US3239769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fm detectors employing exponential functions
Assignee: International Business Machines Corp
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Filing: 1963-03-27
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Granted: 1966-03-08
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Expires: 1983-03-27
Abstract
No abstract record available.
Inventors
- 👤 Lee Hua-Tung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:13
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/10; H04L27/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A CIRCUIT FOR DEMODULATING A FREQUENCY MODULATED, TIME-VARYING SIGNAL COMPRISING, IN COMBINATION: MEANS RESPONSIVE TO THE TIME-VARYING SIGNAL FOR GENERATING A SECOND TIME-VARYING SIGNAL WHICH IS DEPENDENT SOLELY UPON THE ORIGINAL TIME-VARYING SIGNAL AND IS RELATED TO THIS SIGNAL BY AN EXPONENTIAL FUNCTION; MEANS RESPONSIVE TO THE SECOND TIME-VARYING SIGNAL FOR GENERATING A THIRD TIME-VARYING SIGNAL WHICH IS DEPENDENT SOLELY UPON THE SECOND TIME-VARYING SIGNAL AND IS RELATED TO THIS SIGNAL BY AN EXPONENTIAL FUNCTION; AND MEANS RESPONSIVE TO THE THIRD TIME-VARYING SIGNAL FOR PROVIDING AN INDICATION OF THE EXISTENCE OF ENERGY IN AT LEAST ONE PREDETERMINED BAND OF FREQUENCIES.
Claim 2
Dependent Claim
100 words
A CIRCUIT FOR DEMODULATING A FREQUENCY MODULATED, TIME-VARYING SIGNAL COMPRISING, IN COMBINATION: MEANS RESPONSIVE TO THE TIME-VARYING SIGNAL FOR GENERATING A SECOND TIME-VARYING SIGNAL WHICH IS DEPENDENT SOLELY UPON THE ORIGINAL TIME-VARYING SIGNAL AND IS RELATED TO THIS SIGNAL BY AN EXPONENTIAL FUNCTION; MEANS RESPONSIVE TO THE SECOND TIME-VARYING SIGNAL FOR GENERATING A THIRD TIME-VARYING SIGNAL WHICH IS DEPENDENT SOLELY UPON THE SECOND TIME-VARYING SIGNAL AND IS RELATED TO THIS SIGNAL BY AN EXPONENTIAL FUNCTION; AND MEANS RESPONSIVE TO THE THIRD TIME-VARYING SIGNAL FOR PROVIDING AN INDICATION OF THE EXISTENCE OF ENERGY IN AT LEAST ONE PREDETERMINED BAND OF FREQUENCIES.
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) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |