Patent US3376746A successfully refreshed from Google Patents.
US3376746A
Expired / Lapsed
US
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Electrical circuit for capacitor probe
Assignee: CHARLES F WARRICK CO
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Filing: 1965-05-14
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Granted: 1968-04-09
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Expires: 1985-05-14
Abstract
No abstract record available.
Inventors
- 👤 Gordon A Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:33
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/26; G01F23/263; G01F23/266; G01R; G01R17/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A NORMALLY UNBALANCED BRIDGE CIRCUIT FOR PRODUCING AN OUTPUT LINEARLY RELATED TO AN ADMITTANCE CHANGE, COMPRISING IN COMBINATION: A FIRST ALTERNATING VOLTAGE SOURCE AND A FIRST ADMITTANCE IN SERIES THEREWITH BETWEEN A PAIR OF POINTS; A SECOND ALTERNATING VOLTAGE SOURCE AND A SECOND ADMITTANCE IN SERIES THEREWITH BETWEEN SAID PAIR OF POINTS, AT LEAST ONE OF SAID ADMITTANCES BEING VARIABLE TO PROVIDE AN ADMITTANCE CHANGE TO BE MEASURED; A PHASE SENSITIVE, CURRENT SENSING DEVICE HAVING AN INPUT IMPEDANCE OF VALUE NEGLIGIBLE IN COMPARISON TO THE DIFFERENCE BETWEEN SAID FIRST AND SECOND ADMITTANCES AND CONNECTED AS A CURRENT SHUNT BETWEEN SAID POINTS, THE CHANGE IN CURRENT FLOW THROUGH SAID SHUNT BEING A LINEAR FUNCTION OF SAID ADMITTANCE CHANGE TO THE EXTENT THAT SAID SHUNT FAILS TO IMPEDE CURRENT FLOW THERETHROUGH.
Claim 2
Dependent Claim
129 words
A NORMALLY UNBALANCED BRIDGE CIRCUIT FOR PRODUCING AN OUTPUT LINEARLY RELATED TO AN ADMITTANCE CHANGE, COMPRISING IN COMBINATION: A FIRST ALTERNATING VOLTAGE SOURCE AND A FIRST ADMITTANCE IN SERIES THEREWITH BETWEEN A PAIR OF POINTS; A SECOND ALTERNATING VOLTAGE SOURCE AND A SECOND ADMITTANCE IN SERIES THEREWITH BETWEEN SAID PAIR OF POINTS, AT LEAST ONE OF SAID ADMITTANCES BEING VARIABLE TO PROVIDE AN ADMITTANCE CHANGE TO BE MEASURED; A PHASE SENSITIVE, CURRENT SENSING DEVICE HAVING AN INPUT IMPEDANCE OF VALUE NEGLIGIBLE IN COMPARISON TO THE DIFFERENCE BETWEEN SAID FIRST AND SECOND ADMITTANCES AND CONNECTED AS A CURRENT SHUNT BETWEEN SAID POINTS, THE CHANGE IN CURRENT FLOW THROUGH SAID SHUNT BEING A LINEAR FUNCTION OF SAID ADMITTANCE CHANGE TO THE EXTENT THAT SAID SHUNT FAILS TO IMPEDE CURRENT FLOW THERETHROUGH.
References Cited (Backward Citations)
US2976727A
Cited
US3249833A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-09 | 1971-10-09 | 1972-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-09 | 1975-10-09 | 1976-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-09 | 1979-10-09 | 1980-04-09 | $7700.00 | Window Closed / Lapsed |