US3128437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Balanced frequency detector circuit
Assignee: Hazeltine Research Inc
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Filing: 1961-01-24
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Granted: 1964-04-07
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Expires: 1981-01-24
Abstract
No abstract record available.
Inventors
- 👤 Bernard D Loughlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:34
CPC Classifications
H; H04; H04H; H04H20/00; H04H20/86; H04H20/88; H03; H03D; H03D3/00; H04B; H04B14/00; H04B14/08; H04J; H04J1/00; H04J1/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A BALANCED FREQUENCY DETECTOR CIRCUIT FOR THE SUBCARRIER CHANNEL OF AN FM/FM MULTIPLEX SIGNAL RECEIVER COMPRISING: MEANS FOR SUPPLYING A SUBCARRIER SIGNAL WHICH MAY BE BOTH FREQUENCY AND AMPLITUDE MODULATED; MEANS FOR DERIVING FROM SAID SUBCARRIER SIGNAL A TRAIN OF PULSES HAVING AN AVERAGE AMPLITUDE COMPONENT DETERMINED BY SAID SUBCARRIER FREQUENCY MODULATION AND, AT LEAST IN PART, BY SAID SUBCARRIER AMPLITUDE MODULATION; AUXILIARY DETECTION MEANS FOR DERIVING A MEASURE OF SAID SUBCARRIER AMPLITUDE MODULATION; AND MEANS FOR COMBINING SAID DERIVED MEASURE OF AMPLITUDE MODULATION WITH SAID PULSE TRAIN TO SUBSTANTIALLY REMOVE ANY EFFECT
Claim 2
Dependent Claim
93 words
A BALANCED FREQUENCY DETECTOR CIRCUIT FOR THE SUBCARRIER CHANNEL OF AN FM/FM MULTIPLEX SIGNAL RECEIVER COMPRISING: MEANS FOR SUPPLYING A SUBCARRIER SIGNAL WHICH MAY BE BOTH FREQUENCY AND AMPLITUDE MODULATED; MEANS FOR DERIVING FROM SAID SUBCARRIER SIGNAL A TRAIN OF PULSES HAVING AN AVERAGE AMPLITUDE COMPONENT DETERMINED BY SAID SUBCARRIER FREQUENCY MODULATION AND, AT LEAST IN PART, BY SAID SUBCARRIER AMPLITUDE MODULATION; AUXILIARY DETECTION MEANS FOR DERIVING A MEASURE OF SAID SUBCARRIER AMPLITUDE MODULATION; AND MEANS FOR COMBINING SAID DERIVED MEASURE OF AMPLITUDE MODULATION WITH SAID PULSE TRAIN TO SUBSTANTIALLY REMOVE ANY EFFECT
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) | 1967-04-07 | 1967-10-07 | 1968-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-07 | 1971-10-07 | 1972-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-07 | 1975-10-07 | 1976-04-07 | $7700.00 | Window Closed / Lapsed |