US3718556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ionic ph control
Assignee: Magna Corp
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Filing: 1970-07-22
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Granted: 1973-02-27
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Expires: 1990-07-22
Abstract
Abstract AN AQUEOUS SYSTEM IS MADE EITHER MORE BASIC OR MORE ACIDIC BY FEEDING A LIQUID CONTAINING A PREPONDERANCE OF PH CHANGING HYDROXYL OR HYDROGEN IONS. THE PH CHANGING IONS ARE PRODUCED AT THE ELECTRODES OF AN ELECTROLYZING SYSTEM. LIQUID FLOWING PAST ONE OF THE ELECTRODES IS RETURNED TO THE AQUEOUS SYSTEM OF WHICH THE PH IS TO BE CONTROLLED AND LIQUID FLOWING PAST THE OTHER ELECTRODE IS DISCHARGED. THE AMOUNT OF PH CHANGE IS CONTROLLABLE, EITHER OPEN-LOOP OR CLOSED-LOOP. CONTROL MAY BE ACHIEVED BY SEVERAL METHODS INCLUDING VARYING THE VOLTAGE APPLIED TO THE ELECTRODES AND VARYING THE FLOW RATE PAST ONE OR BOTH OF THE ELECTRODES.
Inventors
- 👤 G Rohrback
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:24
CPC Classifications
G; G05; G05D; G05D21/00; G05D21/02; C; C02; C02F; C02F1/00; C02F1/46; C02F1/4602; C02F1/461; C02F1/46104; C02F1/4618; C02F1/46109; C02F2001/46133; C02F2001/46152; C02F2001/46157; C02F2209/00; C02F2209/06; C02F2301/00; C02F2301/04; C02F2301/043
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |