US5017295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Divalent silver bactericide for water treatment
Assignee: Mitsubishi Electric Corp
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Filing: 1990-05-01
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Granted: 1991-05-21
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Expires: 2010-05-01
Abstract
Abstract A method or methods of controlling the growth of bacteria in the water of swimming pools and/or industrial water supplies by adding to the water a specified concentration of a stable divalent silver compound. The invention has the advantage over chlorination in that it is odorless and non-volatile. It furthermore is superior to monovalent silver compounds as these compounds do not decompose in the presence of light and resist precipitation by halides and form divalent soluble complexes which in the monovalent state are invariably insoluble solids.
Inventors
- 👤 Marvin S. Antelman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:21
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/50; C02F1/505; C02F2103/00; C02F2103/42
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
42 words
A method for controlling the growth of bacteria in the water of swimming pools and industrial cooling water which comprises adding to the water a stable divalent silver complex compounds, said silver complex compound comprising divalent silver attached to an inorganic ligand.
Claim 2
Independent Claim
42 words
A method for controlling the growth of bacteria in the water of swimming pools and industrial cooling water which comprises adding to the water a stable divalent silver complex compounds, said silver complex compound comprising divalent silver attached to an inorganic ligand.
Claim 3
Dependent Claim
30 words
A method as claimed in claim 1 wherein the divalent silver complex compound is used in a amount to provide a silver concentration from 0.5 to 15 parts per million.
Claim 4
Dependent Claim
11 words
The method of claim 1 wherein said inorganic ligand is fluoborate.
Claim 5
Dependent Claim
11 words
The method of claim 1 wherein said inorganic ligand is phosphate.
Claim 6
Dependent Claim
36 words
The method of claim 1 wherein the divalent silver complex compound is light stable so as not to discolor or leave black silver films on the inner surface of vessels containing the water to be treated.
References Cited (Backward Citations)
US4055655A
Cited
US4092245A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-20 | 1994-11-19 | 1995-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-20 | 1998-11-19 | 1999-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-20 | 2002-11-19 | 2003-05-21 | $7700.00 | Window Closed / Lapsed |