US3147448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Four layer diode sweep search afc circuit
Assignee: Hazeltine Research Inc
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Filing: 1961-01-30
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Granted: 1964-09-01
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Expires: 1981-01-30
Abstract
No abstract record available.
Inventors
- 👤 Ronald A Orlando
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:06
CPC Classifications
H; H03; H03J; H03J7/00; H03J7/02; H03J7/04; H03J7/047
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
178 words
A CONTROL CIRCUIT PRODUCING A SUBSTANTIALLY D.-C. CONTROL SIGNAL OUTPUT IN RESPONSE TO AN INPUT SIGNAL OF AT LEAST A MINIMUM AMPLITUDE AND A SUBSTANTIALLY SAW-TOOTH SIGNAL OUTPUT WHEN THE INPUT SIGNAL FALLS BELOW SAID MINIMUM AMPLITUDE COMPRISING: INPUT MEANS FOR ACCEPTING AN INPUT SIGNAL WHOSE AMPLITUDE IS REPRESENTATIVE OF THE OPERATING CONDITION OF EXTERNAL APPARATUS WHICH IS TO BE CONTROLLED; A CAPACITOR ARRANGED TO PRODUCE A SUBSTANTIALLY SAW-TOOTH OUTPUT IF ALLOWED TO REPEATEDLY CHARGE AND DISCHARGE; A SWITCHING DEVICE COUPLED TO SAID CAPACITOR AND A SOURCE OF POTENTIAL, AND ARRANGED TO ALLOW THE CAPACITOR TO RECHARGE EACH TIME THE CHARGE ON SAID CAPACITOR FALLS BELOW A PREDETERMINED VALUE; AND MEANS COUPLED TO SAID SWITCHING DEVICE AND SAID INPUT MEANS FOR SUPPLYING IN RESPONSE TO SAID INPUT SIGNAL A SUBSTANTIALLY D.-C. SIGNAL WHOSE MAGNITUDE IS DETERMINED BY SAID INPUT SIGNAL, SAID D.-C. SIGNAL BEING EFFECTIVE TO PREVENT THE SWITCHING DEVICE FROM ALLOWING THE CAPACITOR TO RECHARGE WHENEVER THE INPUT SIGNAL EXCEEDS SAID MINIMUM AMPLITUDE AND SAID D.-C. SIGNAL BEING AVAILABLE AS A CONTROL SIGNAL OUTPUT IN THIS CASE.
Claim 2
Dependent Claim
178 words
A CONTROL CIRCUIT PRODUCING A SUBSTANTIALLY D.-C. CONTROL SIGNAL OUTPUT IN RESPONSE TO AN INPUT SIGNAL OF AT LEAST A MINIMUM AMPLITUDE AND A SUBSTANTIALLY SAW-TOOTH SIGNAL OUTPUT WHEN THE INPUT SIGNAL FALLS BELOW SAID MINIMUM AMPLITUDE COMPRISING: INPUT MEANS FOR ACCEPTING AN INPUT SIGNAL WHOSE AMPLITUDE IS REPRESENTATIVE OF THE OPERATING CONDITION OF EXTERNAL APPARATUS WHICH IS TO BE CONTROLLED; A CAPACITOR ARRANGED TO PRODUCE A SUBSTANTIALLY SAW-TOOTH OUTPUT IF ALLOWED TO REPEATEDLY CHARGE AND DISCHARGE; A SWITCHING DEVICE COUPLED TO SAID CAPACITOR AND A SOURCE OF POTENTIAL, AND ARRANGED TO ALLOW THE CAPACITOR TO RECHARGE EACH TIME THE CHARGE ON SAID CAPACITOR FALLS BELOW A PREDETERMINED VALUE; AND MEANS COUPLED TO SAID SWITCHING DEVICE AND SAID INPUT MEANS FOR SUPPLYING IN RESPONSE TO SAID INPUT SIGNAL A SUBSTANTIALLY D.-C. SIGNAL WHOSE MAGNITUDE IS DETERMINED BY SAID INPUT SIGNAL, SAID D.-C. SIGNAL BEING EFFECTIVE TO PREVENT THE SWITCHING DEVICE FROM ALLOWING THE CAPACITOR TO RECHARGE WHENEVER THE INPUT SIGNAL EXCEEDS SAID MINIMUM AMPLITUDE AND SAID D.-C. SIGNAL BEING AVAILABLE AS A CONTROL SIGNAL OUTPUT IN THIS CASE.
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) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |