US4898681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hypochlorite distinfectant stabilized with calcium chelant
Assignee: Caltech Industries Inc
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Filing: 1988-08-31
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Granted: 1990-02-06
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Expires: 2008-08-31
Abstract
Abstract Dilute aqueous sodium hypochlorite solution is stabilized against decomposition during storage by incorporating in it a small proportion of the calcium chelate of disodium ethylenediaminetetraacetic acid. The solution preferably contains by weight at least 95 percent water, from 0.25 to 1 percent sodium hypochlorite, and from 0.005 to 0.25 percent of the calcium chelate. It may be stored for a period of many months and remains effective as a disinfectant for medical environmental surfaces. The solution may also be formulated to contain a synthetic detergent, such as sodium lauryl sulfate, 0.1 to 3 percent, and an alkaline builder, such as sodium metasilicate, to maintain a pH value above 11. Sodium hydroxide may be added to produce a pH above 12.
Inventors
- 👤 Charles D. Burton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:59
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/48; A; A01; A01N; A01N59/00; C11D3/395; C11D3/3956
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
33 words
A dilute aqueous sodium hypochlorite solution stabilized against decomposition during storage consisting essentially of dilute aqueous sodium hypochlorite and a small but effectively stabilizing proportion of the calcium chelate of disodium ethylenediaminetetraacetic acid.
Claim 2
Dependent Claim
33 words
A dilute aqueous sodium hypochlorite solution stabilized against decomposition during storage consisting essentially of dilute aqueous sodium hypochlorite and a small but effectively stabilizing proportion of the calcium chelate of disodium ethylenediaminetetraacetic acid.
Claim 3
Dependent Claim
52 words
A disinfectant solution consisting essentially of at least about 95 percent by weight of water, from about 0.25 to about 1 percent of sodium hypochlorite as active disinfectant, and from about 0.005 to about 0.25 percent of the calcium chelate of disodium ethylenediaminetetraacetic acid to stabilize the hypochlorite against decomposition during storage.
Claim 4
Dependent Claim
52 words
A disinfectant solution consisting essentially of at least about 95 percent by weight of water, from about 0.25 to about 1 percent of sodium hypochlorite as active disinfectant, and from about 0.005 to about 0.25 percent of the calcium chelate of disodium ethylenediaminetetraacetic acid to stabilize the hypochlorite against decomposition during storage.
Claim 5
Dependent Claim
17 words
A disinfectant according to claim 2 also containing a synthetic detergent stable in the presence of hypochlorite.
Claim 6
Dependent Claim
25 words
A disinfectant according to claim 3 in which the detergent is sodium lauryl sulfate in a concentration of from about 0.1 to about 3 percent.
Claim 7
Dependent Claim
24 words
A disinfectant according to claim 3 also containing a soluble alkaline builder in a proportion sufficient to maintain a pH value above about 11.
Claim 8
Dependent Claim
13 words
A disinfectant according to claim 5 in which the builder is sodium metasilicate.
Claim 9
Dependent Claim
22 words
A disinfectant according to claim 5 also containing sodium hydroxide in a proportion sufficient to maintain a pH value above about 12.
Claim 10
Dependent Claim
70 words
A disinfectant stabilized against decomposition on storage consisting essentially of the following components in approximate proportions by weight: deionized water, at least 95 percent; sodium hypochlorite, 0.5 to 1 percent; the calcium chelate of disodium ethylenediaminetetraacetic acid, 0.01 to 0.02 percent; sodium lauryl sulfate, 0.1 to 1 percent; sodium metasilicate, 0.1 to 1 percent; and a sodium hydroxide, about 0.1 percent (to maintain a pH value of at least 12).
Claim 11
Dependent Claim
70 words
A disinfectant stabilized against decomposition on storage consisting essentially of the following components in approximate proportions by weight: deionized water, at least 95 percent; sodium hypochlorite, 0.5 to 1 percent; the calcium chelate of disodium ethylenediaminetetraacetic acid, 0.01 to 0.02 percent; sodium lauryl sulfate, 0.1 to 1 percent; sodium metasilicate, 0.1 to 1 percent; and a sodium hydroxide, about 0.1 percent (to maintain a pH value of at least 12).
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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) | 1993-02-05 | 1993-08-07 | 1994-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-05 | 1997-08-07 | 1998-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-05 | 2001-08-07 | 2002-02-06 | $7700.00 | Window Closed / Lapsed |