US3785954A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for treating water charged with scale forming substances
Assignee: Individual
•
Filing: 1972-05-17
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Granted: 1974-01-15
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Expires: 1992-05-17
Abstract
Abstract Apparatus for treating water by electrical means in order to eliminate scale-generating substances, comprising electrodes dipping into the water to be treated and connected to the mains supply through a transformer having an adjustable secondary connected to a rectifier bridge which is in turn connected to the electrodes for the purpose of obtaining a chopped current having its direction periodically reversed by a timer. The electrodes are flat and are used in sets of three. Each set comprises a central electrode flanked by two parallel-connected lateral electrodes, the electrodes and their supporting current-supplying rods being made of stainless steel.
Inventors
- 👤 J Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:39
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/46; C02F1/461; C02F1/46104; C02F1/46109; C02F1/4602; C02F2001/46119; C02F2001/46152; C02F2201/00; C02F2201/46; C02F2201/461; C02F2201/46105; C02F2201/4611; C02F2201/4612; C02F2201/46125; C02F2201/4613; C02F2201/4615; C02F2201/4616
Claims Analysis
Total Claims: 0
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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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |