Patent US5327387A successfully refreshed from Google Patents.
US4492618A
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Method of disinfecting water, in particular swimming pool water
Assignee: ROSINIA-STIFTUNG
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Filing: 1984-02-14
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Granted: 1985-01-08
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Expires: 2004-02-14
Abstract
Abstract A method of disinfecting water wherein electrodes of a copper-silver alloy which are immersed in the water and the polarity of which is changed at certain intervals are connected to a direct current source for the production of copper and silver ions. Sodium persulfate is added to the water for oxidation of organic substances. Said method is especially useful for disinfecting swimming pool water resulting in an easily controllable and effective disinfection of the water without any damage to the human body.
Inventors
- 👤 Bernd Eder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:43
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/46; C02F1/461; C02F1/46104; C02F1/46109; C02F1/4606; C02F1/50; C02F1/505; C02F1/66; C02F1/72; C02F1/722; C02F2001/46133; C02F2103/00; C02F2103/42; C02F2201/00; C02F2201/46; C02F2201/461; C02F2201/46105; C02F2201/4612; C02F2201/46125; C02F2201/4613; C02F2303/00; C02F2303/04; C02F9/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
63 words
A method of disinfecting water comprising the steps: (a) immersing electrodes of a copper-silver alloy in the water, (b) applying to the electrodes current from a direct current source and changing the polarity of the applied current at certain time intervals to produce copper and silver ions, (c) and adding sodium persulfate to the water to oxidize organic substances present in the water.
Claim 2
Independent Claim
63 words
A method of disinfecting water comprising the steps: (a) immersing electrodes of a copper-silver alloy in the water, (b) applying to the electrodes current from a direct current source and changing the polarity of the applied current at certain time intervals to produce copper and silver ions, (c) and adding sodium persulfate to the water to oxidize organic substances present in the water.
Claim 3
Dependent Claim
32 words
A method as claimed in claim 1, wherein during an initial phase of step(b), the quantity of sodium persulfate added per week is about 60-100 g per 10 m 3 of water.
Claim 4
Dependent Claim
41 words
A method as claimed in claim 1 or 2, wherein during a later phase of step (b) constituting normal operation of the method, the quantity of sodium persulfate added per week is about 50 g per 10 m 3 of water.
Claim 5
Dependent Claim
31 words
A method as claimed in claim 1 or 2, wherein a pH-reducing substance is added to the water for neutralization upon the pH value of the water exceeding a neutral value.
Claim 6
Dependent Claim
29 words
A method as claimed in claim 3, wherein a pH-reducing substance is added to the water for neutralization upon the pH value of the water exceeding a neutral value.
Claim 7
Dependent Claim
14 words
A method as claimed in claim 4, wherein the pH-reducing substance is sulfuric acid.
Claim 8
Dependent Claim
14 words
A method as claimed in claim 5, wherein the pH-reducing substance is sulfuric acid.
Claim 9
Dependent Claim
17 words
A method as claimed in claim 4, wherein only the added sodium persulfate is utilized for neutalization.
Claim 10
Dependent Claim
17 words
A method as claimed in claim 5, wherein only the added sodium persulfate is utilized for neutralization.
Claim 11
Independent Claim
64 words
A method of disinfecting swimming pool water circulated through a filter system via connecting lines by immersing in the water circulating in one of the connecting lines copper-silver alloy electrodes across which is applied a direct current potential which changes at certain intervals to produce copper and silver ions, and adding to the water sodium persulfate in quantities sufficient to oxidize organic material present.
Claim 12
Independent Claim
64 words
A method of disinfecting swimming pool water circulated through a filter system via connecting lines by immersing in the water circulating in one of the connecting lines copper-silver alloy electrodes across which is applied a direct current potential which changes at certain intervals to produce copper and silver ions, and adding to the water sodium persulfate in quantities sufficient to oxidize organic material present.
Claim 13
Dependent Claim
40 words
A method as set forth in claim 10 wherein the quantity of the sodium persulfate added is about 20-100 g/10 m 3 water per week, and the copper-silver ratio of the electrodes varies between 80:20 and 90:10 percent by weight.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-08 | 1988-07-09 | 1989-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-08 | 1992-07-09 | 1993-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-08 | 1996-07-09 | 1997-01-08 | $7700.00 | Window Closed / Lapsed |