System for controlling the electrical field in a fluid analyzing chamber
Abstract
Abstract A sample analyzing chamber for flow-through analysis of a sample solution includes an equipotential screen disposed adjacent the tips or active portions of all electrodes in the chamber. The voltage sensed by the reference electrode is amplified and inverted by a control amplifier, the output of which is applied to the screen. Any deviation of the reference electrode potential from the ground potential of the circuitry of the electrometer or other utilization means results in the application of a voltage from the control amplifier to the screen. This voltage is of proper amplitude and polarity to drive the reference electrode and the potential of the solution in the vicinity of the screen back to ground potential. The ion-sensing electrode signal, which is now referred to ground, is coupled to the electrometer.
Inventors
- 👤 Marshall E Evans
- 👤 David M H Platt
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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |