Capacitance type fluid measuring apparatus
Abstract
Abstract THE MEASURING APPARATUS INCLUDES AT LEAST ONE MEASURING CONDENSER IMMERSIBLE IN FLUID IN A CONTAINER. AN A.C. DRIVING VOLTAGE IS APPLIED TO EACH MEASURING CONDENSER TO PRODUCE A CURRENT. CIRCUIT MEANS PRODUCE AN OUTPUT VOLTAGE PROPORTIONAL TO THE EXCESS OF THE MEASURING CONDENSER CURRENT OVER THE VALUE OF CURRENT WHICH WOULD FLOW THROUGH THE MEASURING CONDENSER, IN RESPONSE TO THE DRIVING VOLTAGE, IF THE CONDENSER WERE DRY. THE DRIVING VOLTAGE IS THE SUM OF A FIXED A.C. VOLTAGE SOURCE AND A VOLTAGE PROPORTIONAL TO THE OUTPUT VOLTAGE. THE OUTPUT VOLTAGE IS THEREFORE PROPORTIONAL TO THE WEIGHT OF FLUID IN THE CONTAINER. IF MORE THAN ONE MEASURING CONDENSER IS USED, AN INDIVIDUAL OUTPUT VOLTAGE IS PRODUCED FOR EACH, AND THOSE VOLTAGES ARE SUMMED TO PRODUCE A SINGLE READOUT VOLTAGE.
Inventors
- 👤 Frederick L Ryder
Bibliographic Details
Claims Analysis
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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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |