Patent US3398366A successfully refreshed from Google Patents.
US3398366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Highly accurate frequency measuring circuit
Assignee: Westinghouse Electric Corp
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Filing: 1965-01-29
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Granted: 1968-08-20
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Expires: 1985-01-29
Abstract
No abstract record available.
Inventors
- 👤 Otto L Apfelbeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:44
CPC Classifications
G; G01; G01R; G01R23/00; G01R23/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A FREQUENCY MEASURING CIRCUIT COMPRISING A TEMPERATURE STABLE RAMP VOLTAGE GENERATOR, MEANS FOR RESETTING SAID RAMP VOLTAGE GENERATOR AT SUCCESSIVE SUBSTANTIALLY IDENTICAL CYCLE POINTS OF AN INPUT CYCLICAL SIGNAL, VOLTAGE COMPARISON CIRCUIT MEANS INCLUDING MEANS FOR ESTABLISHING A REFERENCE AND SOLID STATE MEANS FOR COMPARING THE RAMP VOLTAGE TO THE REFERENCE VOLTAGE, LOGIC CIRCUIT MEANS CONNECTED TO RESPOND TO THE LAST MENTIONED CIRCUIT MEANS TO PROVIDE AN OUTPUT INDICATION WHEN SAID RAMP VOLTAGE EXCEEDS SAID REFERENCE VOLTAGE LEVEL, SAID LOGIC CIRCUIT MEANS INCLUDING A SOLID STATE FLIP-FLOP BLOCK HAVING A SET TERMINAL CONNECTED TO RESPOND TO SAID VOLTAGE COMPARISON CIRCUIT MEANS AND RESET TERMINAL CONNECTED TO RESPOND TO SAID RESET MEANS TO PROVIDE A TEMPORARY OUTPUT INDICATION OF EXCESSIVE RAMP VOLTAGE AND A SOLID STATE SHIFT REGISTER CONNECTED TO RESPOND TO SAID FLIP-FLOP BLOCK AND SAID RESET MEANS TO PROVIDE A CONTINUOUS OUTPUT INDICATION OF THE FREQUENCY LEVEL OF SAID INPUT SIGNAL.
Claim 2
Dependent Claim
152 words
A FREQUENCY MEASURING CIRCUIT COMPRISING A TEMPERATURE STABLE RAMP VOLTAGE GENERATOR, MEANS FOR RESETTING SAID RAMP VOLTAGE GENERATOR AT SUCCESSIVE SUBSTANTIALLY IDENTICAL CYCLE POINTS OF AN INPUT CYCLICAL SIGNAL, VOLTAGE COMPARISON CIRCUIT MEANS INCLUDING MEANS FOR ESTABLISHING A REFERENCE AND SOLID STATE MEANS FOR COMPARING THE RAMP VOLTAGE TO THE REFERENCE VOLTAGE, LOGIC CIRCUIT MEANS CONNECTED TO RESPOND TO THE LAST MENTIONED CIRCUIT MEANS TO PROVIDE AN OUTPUT INDICATION WHEN SAID RAMP VOLTAGE EXCEEDS SAID REFERENCE VOLTAGE LEVEL, SAID LOGIC CIRCUIT MEANS INCLUDING A SOLID STATE FLIP-FLOP BLOCK HAVING A SET TERMINAL CONNECTED TO RESPOND TO SAID VOLTAGE COMPARISON CIRCUIT MEANS AND RESET TERMINAL CONNECTED TO RESPOND TO SAID RESET MEANS TO PROVIDE A TEMPORARY OUTPUT INDICATION OF EXCESSIVE RAMP VOLTAGE AND A SOLID STATE SHIFT REGISTER CONNECTED TO RESPOND TO SAID FLIP-FLOP BLOCK AND SAID RESET MEANS TO PROVIDE A CONTINUOUS OUTPUT INDICATION OF THE FREQUENCY LEVEL OF SAID INPUT SIGNAL.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-20 | 1972-02-19 | 1972-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-20 | 1976-02-19 | 1976-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-20 | 1980-02-19 | 1980-08-20 | $7700.00 | Window Closed / Lapsed |