US3075146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
D.-c. voltage measuring apparatus
Assignee: Schneider Electric Systems USA Inc
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Filing: 1959-09-15
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Granted: 1963-01-22
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Expires: 1979-09-15
Abstract
No abstract record available.
Inventors
- 👤 Leon G S Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:13
CPC Classifications
G; G01; G01R; G01R17/00; G01R17/02; G01R17/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
IN D.C. VOLTAGE-MEASURING APPARATUS, THE COMBINATION OF: A D.-C. POWER SUPPLY, FIRST AND SECOND CAPACITORS TO BE ENERGIZED BY SAID POWER SUPPLY, FIRST SWITCH MEANS ARRANGED TO PERIODICALLY ENERGIZE SAID TWO CAPACITORS FROM SAID POWER SUPPLY, THE VOLTAGE ACROSS SAID FIRST CAPACITOR BEING VARIABLE IN RESPONSE TO CHANGES IN THE CAPACITY OF SAID SECOND CAPACITOR; SECOND SWITCH MEANS SYNCHRONIZED WITH SAID FIRST SWITCH MEANS AND INCLUDING MEANS TO ALTERNATELY SAMPLE (1) THE VOLTAGE ACROSS SAID FIRST CAPACITOR AND (2) AN UNKNOWN VOLTAGE TO BE MEASURED, AND TO PRODUCE A COMPARISON SIGNAL CORRESPONDING TO THE DIFFERENCE BETWEEN SAID TWO VOLTAGES; MOTOR DRIVE MEANS OPERABLE IN RESPONSE TO CHANGES IN SAID COMPARISON SIGNAL, AND MEANS CONTROLLED BY SAID MOTOR DRIVE MEANS FOR ALTERING THE CAPACITY OF SAID SECOND CAPACITOR IN A DIRECTION TO MAKE THE VOLTAGE ACROSS SAID FIRST CAPACITOR EQUAL TO SAID UNKNOWN VOLTAGE.
Claim 2
Dependent Claim
143 words
IN D.C. VOLTAGE-MEASURING APPARATUS, THE COMBINATION OF: A D.-C. POWER SUPPLY, FIRST AND SECOND CAPACITORS TO BE ENERGIZED BY SAID POWER SUPPLY, FIRST SWITCH MEANS ARRANGED TO PERIODICALLY ENERGIZE SAID TWO CAPACITORS FROM SAID POWER SUPPLY, THE VOLTAGE ACROSS SAID FIRST CAPACITOR BEING VARIABLE IN RESPONSE TO CHANGES IN THE CAPACITY OF SAID SECOND CAPACITOR; SECOND SWITCH MEANS SYNCHRONIZED WITH SAID FIRST SWITCH MEANS AND INCLUDING MEANS TO ALTERNATELY SAMPLE (1) THE VOLTAGE ACROSS SAID FIRST CAPACITOR AND (2) AN UNKNOWN VOLTAGE TO BE MEASURED, AND TO PRODUCE A COMPARISON SIGNAL CORRESPONDING TO THE DIFFERENCE BETWEEN SAID TWO VOLTAGES; MOTOR DRIVE MEANS OPERABLE IN RESPONSE TO CHANGES IN SAID COMPARISON SIGNAL, AND MEANS CONTROLLED BY SAID MOTOR DRIVE MEANS FOR ALTERING THE CAPACITY OF SAID SECOND CAPACITOR IN A DIRECTION TO MAKE THE VOLTAGE ACROSS SAID FIRST CAPACITOR EQUAL TO SAID UNKNOWN VOLTAGE.
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) | 1966-01-21 | 1966-07-23 | 1967-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-21 | 1970-07-23 | 1971-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-21 | 1974-07-23 | 1975-01-22 | $7700.00 | Window Closed / Lapsed |