Patent US3168658A successfully refreshed from Google Patents.
US3168658A
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Direct current integrating circuits
Assignee: Elster Metering Holdings Ltd
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Filing: 1963-03-22
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Granted: 1965-02-02
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Expires: 1983-03-22
Abstract
No abstract record available.
Inventors
- 👤 Marshali Richard Carlile
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:08
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/18; H03K7/00; H03K7/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A DIRECT CURRENT INTEGRATING CIRCUIT COMPRISING REVERSIBLE SWITCH MEANS FOR APPLYING AN INPUT CURRENT TO A FIXED VALUE CAPACITANCE, VOLTAGE DETECTING MEANS ARRANGED REPEATEDLY TO SENSE THE CHARGE VOLTAGE ON THE CAPACITANCE AND MEANS CONTROLLED BY THE DETECTING MEANS FOR OPERATING THE REVERSIBLE SWITCH MEANS INITIALLY TO APPLY THE INPUT CURRENT TO CHARGE THE CAPACITANCE UP TO A PREDETERMINED REFERENCE LEVEL AND SUBSEQUENTLY TO APPLY THE INPUT CURRENT IN REVERSE DIRECTION TO DISCHARGE THE CAPACITANCE DOWN TO A PREDETERMINED SECOND REFERENCE LEVEL BEFORE COMMENCEMENT OF A FOLLOWING CHARGE-DISCHARGE CYCLE, THE SWITCH OPERATING MEANS BEING ARRANGED TO INITIATE AN OUTPUT PULSE TO MARK EACH CHARGE-DISCHARGE CYCLE.
Claim 2
Dependent Claim
105 words
A DIRECT CURRENT INTEGRATING CIRCUIT COMPRISING REVERSIBLE SWITCH MEANS FOR APPLYING AN INPUT CURRENT TO A FIXED VALUE CAPACITANCE, VOLTAGE DETECTING MEANS ARRANGED REPEATEDLY TO SENSE THE CHARGE VOLTAGE ON THE CAPACITANCE AND MEANS CONTROLLED BY THE DETECTING MEANS FOR OPERATING THE REVERSIBLE SWITCH MEANS INITIALLY TO APPLY THE INPUT CURRENT TO CHARGE THE CAPACITANCE UP TO A PREDETERMINED REFERENCE LEVEL AND SUBSEQUENTLY TO APPLY THE INPUT CURRENT IN REVERSE DIRECTION TO DISCHARGE THE CAPACITANCE DOWN TO A PREDETERMINED SECOND REFERENCE LEVEL BEFORE COMMENCEMENT OF A FOLLOWING CHARGE-DISCHARGE CYCLE, THE SWITCH OPERATING MEANS BEING ARRANGED TO INITIATE AN OUTPUT PULSE TO MARK EACH CHARGE-DISCHARGE CYCLE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-02-02 | 1968-08-03 | 1969-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-02 | 1972-08-03 | 1973-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-02 | 1976-08-03 | 1977-02-02 | $7700.00 | Window Closed / Lapsed |