Electrochemical oxygen demand measuring system
Abstract
Abstract An electrochemical oxygen demand measuring system having a pair of test cells containing an aqueous test sample and an aqueous reference sample, respectively. Each test cell has a pair of electrodes immersed in the fluid in the respective cell and connected in a series path between output terminal of a predetermined current source. Electrolysis of the respective fluids produces gaseous products from each cell with the net amount of test sample cell electrolysis products being affected by the oxygen demand of the test sample. The gaseous products from each cell are collected and applied to respective sides of a differential pressure measuring apparatus to produce an indication of the oxygen demand of the test sample.
Inventors
- 👤 J Johnson
Bibliographic Details
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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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |