US4190529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixed-form polyhalide resins for disinfecting water
Assignee: Aqua Chem Inc
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Filing: 1979-02-02
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Granted: 1980-02-26
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Expires: 1999-02-02
Abstract
Abstract A strongly basic anion-exchange resin loaded with iodine and a less than stoichiometic amount of an iodide salt or bromine and a less than stoichiometric amount of bromide salt is an effective demand bactericide for disinfecting water. The bactericidal resin according to the invention elutes only small amounts of halide ions and is especially suited for killing bacteria in feed water supplies having relatively high salt content.
Inventors
- 👤 Gary L. Hatch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:51
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/76; C02F1/766; A; A01; A01N; A01N59/00; A01N59/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
104 words
A method of disinfecting water containing bacteria, said method comprising: (a) providing a quantity of a mixed-form polyhalide bactericidal resin comprising a strong base anion-exchange resin having anion exchange sites and having attached to a predominant number of such sites polyhalide anions of the following formulas: a(I.sub.3.sup.-) and b(I.sub.5.sup.-) wherein: a=0.4 to 0.8 of the exchange sites; b=0.1 to 0.3 of the exchange sites; a+b=a predominant number of the anion sites available for exchange; and a+2(b) equals or exceeds 1.0; (b) contacting the water to be disinfected with said resin at a flow rate controlled to permit killing of substantially all bacteria contained therein.
Claim 2
Independent Claim
104 words
A method of disinfecting water containing bacteria, said method comprising: (a) providing a quantity of a mixed-form polyhalide bactericidal resin comprising a strong base anion-exchange resin having anion exchange sites and having attached to a predominant number of such sites polyhalide anions of the following formulas: a(I.sub.3.sup.-) and b(I.sub.5.sup.-) wherein: a=0.4 to 0.8 of the exchange sites; b=0.1 to 0.3 of the exchange sites; a+b=a predominant number of the anion sites available for exchange; and a+2(b) equals or exceeds 1.0; (b) contacting the water to be disinfected with said resin at a flow rate controlled to permit killing of substantially all bacteria contained therein.
Claim 3
Dependent Claim
11 words
The method as claimed in claim 1 wherein a=0.6 and b=0.2.
Claim 4
Dependent Claim
17 words
The method as claimed in claim 1 wherein said resin is the resin claimed in claim 2.
Claim 5
Dependent Claim
29 words
The method as claimed in claim 1 comprising the additional step of passing the treated water through a distinct quantity of a strong base anion-exchange resin in chloride form.
Claim 6
Dependent Claim
30 words
The method as claimed in claim 4 comprising the further steps of providing a quantity of activated charcoal and passing said twice treated water through said bed of activated charcoal.
Claim 7
Dependent Claim
29 words
The method as claimed in claim 1 comprising the additional steps of providing a quantity of activated charcoal and passing said treated water through said bed of activated charcoal.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-25 | 1983-08-27 | 1984-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-25 | 1987-08-27 | 1988-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-25 | 1991-08-27 | 1992-02-26 | $7700.00 | Window Closed / Lapsed |