Patent US2112824A successfully refreshed from Google Patents.
US4043932A
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Water sterilizing agent
Assignee: Individual
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Filing: 1975-11-21
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Granted: 1977-08-23
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Expires: 1995-11-21
Abstract
Abstract A chlorine and silver-containing water sterilizing agent, comprising a sodium-silver-chloride complex consisting of a water-soluble silver compound and sodium chloride, and an excess of sodium chloride.
Inventors
- 👤 Wilhelm Fresenius
- 👤 Remigius Fresenius
- 👤 Ludwig Fresenius
- 👤 Wilhelm Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:05
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/76; C02F1/50; C02F1/505
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
77 words
a dry, light-resistant, silver-based composition for sterilizing water, consisting essentially of (1) a sodium-silver-chloride complex, (2) an excess of sodium chloride, the mol ratio of the complex bound silver to the total amount of complex bound and free sodium chloride being 1:10 to 1:10,000, (3) 30 to 95% by weight of the composition of an alkali hydrogen carbonate as a buffer and (4) 0.1-5% by weight of the composition of calcium hypochlorite capable of splitting off chlorine.
Claim 2
Dependent Claim
77 words
a dry, light-resistant, silver-based composition for sterilizing water, consisting essentially of (1) a sodium-silver-chloride complex, (2) an excess of sodium chloride, the mol ratio of the complex bound silver to the total amount of complex bound and free sodium chloride being 1:10 to 1:10,000, (3) 30 to 95% by weight of the composition of an alkali hydrogen carbonate as a buffer and (4) 0.1-5% by weight of the composition of calcium hypochlorite capable of splitting off chlorine.
Claim 3
Dependent Claim
13 words
The composition of claim 1 wherein the buffer is is sodium hydrogen carbonate.
Claim 4
Dependent Claim
18 words
The composition of claim 1 wherein the complex is the reaction product of silver sulfate and sodium sulfate.
Claim 5
Dependent Claim
29 words
The composition of claim 1, wherein the mol ratio of the complex bound silver to the total amount of complex bound and free sodium chloride is 1:100 to 1:300.
Claim 6
Dependent Claim
29 words
The composition of claim 1, wherein the mol ratio of the complex bound silver to the total amount of complex bound and free sodium chloride is 1:200 to 1:2000.
References Cited (Backward Citations)
US2320280A
Cited
US2396515A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |