Patent US3523158A successfully refreshed from Google Patents.
US3149243A
Expired / Lapsed
US
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Radio receiver including a monitoring circuit indicating an output upon input exceeding predetermined frequency
Assignee: International Standard Electric Corp
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Filing: 1962-07-10
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Granted: 1964-09-15
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Expires: 1982-07-10
Abstract
No abstract record available.
Inventors
- 👤 Garfield William Littery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:07
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/40; G01S7/4004; G01S7/4021
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
IN A RADIO RECEIVER A WARNING CIRCUIT TO PRODUCE A WARNING SIGNAL WHENEVER UNDESIRED INTERFERENCE SIGNALS ARE RECEIVED WITH DESIRED SINUSOIDAL SIGNALS COMPRISING AN AMPLITUDE LIMITER TO PRODUCE A SUBSTANTIALLY SQUARE WAVE SIGNAL FROM SAID RECEIVED SINUSOIDAL SIGNAL HAVING A PREDETERMINED FREQUENCY, A COUNTING CIRCUIT OF THE INTEGRATOR TYPE, THE OUTPUT FROM THE LIMITER BEING CONNECTED TO THE INPUT TO THE COUNTING CIRCUIT, A GATE CIRCUIT, ONE INPUT OF WHICH IS CONNECTED TO THE OUTPUT FROM THE COUNTING CIRCUIT, MEANS TO APPLY A DIRECT CURRENT BIAS TO A SECOND INPUT TO THE GATE CIRCUIT, THE BIAS BEING OF SUCH A VALUE THAT A SIGNAL IS OBTAINED FROM THE OUTPUT OF THE GATING CIRCUIT DUE TO THE PRESENCE OF INTERFERENCE PULSES IN THE LIMITED SIGNAL WHEN THE FREQUENCY OF THE DESIRED SIGNAL AND THE INTERFERENCE SIGNAL IS GREATER THAN SAID PREDETERMINED FREQUENCY, AND MEANS TO APPLY THE OUTPUT FROM THE GATE CIRCUIT TO OPERATE AN INDICATOR.
Claim 2
Dependent Claim
155 words
IN A RADIO RECEIVER A WARNING CIRCUIT TO PRODUCE A WARNING SIGNAL WHENEVER UNDESIRED INTERFERENCE SIGNALS ARE RECEIVED WITH DESIRED SINUSOIDAL SIGNALS COMPRISING AN AMPLITUDE LIMITER TO PRODUCE A SUBSTANTIALLY SQUARE WAVE SIGNAL FROM SAID RECEIVED SINUSOIDAL SIGNAL HAVING A PREDETERMINED FREQUENCY, A COUNTING CIRCUIT OF THE INTEGRATOR TYPE, THE OUTPUT FROM THE LIMITER BEING CONNECTED TO THE INPUT TO THE COUNTING CIRCUIT, A GATE CIRCUIT, ONE INPUT OF WHICH IS CONNECTED TO THE OUTPUT FROM THE COUNTING CIRCUIT, MEANS TO APPLY A DIRECT CURRENT BIAS TO A SECOND INPUT TO THE GATE CIRCUIT, THE BIAS BEING OF SUCH A VALUE THAT A SIGNAL IS OBTAINED FROM THE OUTPUT OF THE GATING CIRCUIT DUE TO THE PRESENCE OF INTERFERENCE PULSES IN THE LIMITED SIGNAL WHEN THE FREQUENCY OF THE DESIRED SIGNAL AND THE INTERFERENCE SIGNAL IS GREATER THAN SAID PREDETERMINED FREQUENCY, AND MEANS TO APPLY THE OUTPUT FROM THE GATE CIRCUIT TO OPERATE AN INDICATOR.
References Cited (Backward Citations)
US2915648A
Cited
US2995706A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-15 | 1968-03-16 | 1968-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-15 | 1972-03-16 | 1972-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-15 | 1976-03-16 | 1976-09-15 | $7700.00 | Window Closed / Lapsed |