Patent US4800803A successfully refreshed from Google Patents.
Patent US3295372A successfully refreshed from Google Patents.
US3295372A
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Capacitance type fluid measuring apparatus
Assignee: Simmonds Precision Products Inc
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Filing: 1964-07-01
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Granted: 1967-01-03
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Expires: 1984-07-01
Abstract
No abstract record available.
Inventors
- 👤 Alfred D Gronner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:59
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/26; G01F23/263; G01F23/266
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
105 words
A CAPACITANCE FLUID MEASURING APPARATUS FOR INDICATING THE MASS OF FLUID IN A CONTAINER COMPRISING A FIRST CIRCUIT INCLUDING A MEASURING CONDENSER HAVING SPACED ELECTRODES IMMERSED IN SAID FLUID, A LINEARIZING CAPACITOR CONNECTED IN SERIES WITH SAID MEASURING CONDENSER AND AN A.C. VOLTAGE SOURCE FOR ENERGIZING SAID MEASURING CONDENSER, A SECOND CIRCUIT INCLUDING A FIXED SOURCE OF A.C. VOLTAGE AND A VARIABLE SOURCE OF A.C. VOLTAGE, A FIXED REFENCE CAPACITOR, AN AMPLIFIER HAVING AN INPUT CIRCUIT COMMON TO SAID TWO CIRCUITS, VARYING MEANS CONTROLLED BY SAID AMPLIFIER FOR VARYING SAID SECOND CIRCUIT VOLTAGE SO AS TO REDUCE THE CURRENT OUTPUT OF SAID AMPLIFIER TO SUBSTAN-
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) | 1970-01-02 | 1970-07-04 | 1971-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-02 | 1974-07-04 | 1975-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-02 | 1978-07-04 | 1979-01-03 | $7700.00 | Window Closed / Lapsed |