Patent US4986990A successfully refreshed from Google Patents.
US4986990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disinfection method and composition therefor
Assignee: Ecolab USA Inc
•
Filing: 1989-10-11
•
Granted: 1991-01-22
•
Expires: 2009-10-11
Abstract
Abstract There is disclosed, in one aspect, chlorous acid generating compositions useful for disinfecting substrates. The compositions comprise aqueous solutions containing a suitable amount of a protic acid, such as citric or malic acid, and a suitable amount of a metal chlorite, such as sodium chlorite. The chlorite ion concentration which is in the form of chlorous acid in the composition is no more than about 15 percent by weight of the total amount of chlorite ion concentration. In a preferred embodiment, the composition also contains a vicinal dihydroxy or polyhydroxy compound. In another preferred embodiment, the composition contains at least a 10-fold molar excess of a water soluble chloride ion compared to the total concentration of chlorite ion. In another aspect, there is disclosed a process for disinfecting substrates. This process comprises applying the compositions described above to a substrate. In yet another aspect, there is disclosed a process for preparing the compositions described above. This process comprises contacting the protic acid with the metal chlorite to form the disinfecting composition.
Inventors
- 👤 Eugene A. Davidson
- 👤 Robert D. Kross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:25
CPC Classifications
A; A01; A01N; A01N59/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
98 words
A chlorous acid generating composition comprising an aqueous solution consisting essentially of from about 0.01% to about 6% by weight of an organic acid, wherein the pK of the organic acid is from about 2.8 to about 4.2, and wherein the organic acid is not lactic or citric acid, and from about 0.0001% to about 0.45% by weight based upon the total weight of said composition of a metal clorite, such that the chlorite ion concentration in the form of chlorous acid is not more than about 15% by weight of the total amount of chlorite ion concentration.
Claim 2
Dependent Claim
98 words
A chlorous acid generating composition comprising an aqueous solution consisting essentially of from about 0.01% to about 6% by weight of an organic acid, wherein the pK of the organic acid is from about 2.8 to about 4.2, and wherein the organic acid is not lactic or citric acid, and from about 0.0001% to about 0.45% by weight based upon the total weight of said composition of a metal clorite, such that the chlorite ion concentration in the form of chlorous acid is not more than about 15% by weight of the total amount of chlorite ion concentration.
Claim 3
Dependent Claim
72 words
A chlorous acid generating composition comprising an aqueous solution consisting essentially of from about 0.05% to about 3% by weight of citric acid and from about 0.0001% to about 0.45% by weight based upon the total weight of said composition of a metal chlorite, such that the chlorite ion concentration in the form of chlorous acid is no more than about 15% by weight of the total amount of chlorite ion concentration.
Claim 4
Dependent Claim
72 words
A chlorous acid generating composition comprising an aqueous solution consisting essentially of from about 0.05% to about 3% by weight of citric acid and from about 0.0001% to about 0.45% by weight based upon the total weight of said composition of a metal chlorite, such that the chlorite ion concentration in the form of chlorous acid is no more than about 15% by weight of the total amount of chlorite ion concentration.
Claim 5
Dependent Claim
14 words
The composition of claims 1 or 2 wherein the metal chlorite is sodium chlorite.
Claim 6
Dependent Claim
33 words
The composition of claims 1 or 2 wherein the organic acid is selected from the group consisting of malic acid, tartaric acid, glycolic acid, mandelic acid, salicylic acid, carbonic acid, and combinations thereof.
Claim 7
Dependent Claim
14 words
The composition of claims 1 or 2 wherein the organic acid is malic acid.
Claim 8
Dependent Claim
14 words
The composition of claims 1 or 2 wherein the organic acid is tartaric acid.
Claim 9
Dependent Claim
14 words
The composition of claims 1 or 2 wherein the organic acid is glycolic acid.
Claim 10
Dependent Claim
14 words
The composition of claims 1 or 2 wherein the organic acid is mandelic acid.
Claim 11
Dependent Claim
14 words
The composition of claims 1 or 2 wherein the organic acid is salicylic acid.
Claim 12
Dependent Claim
14 words
The composition of claims 1 or 2 wherein the organic acid is carbonic acid.
Claim 13
Dependent Claim
103 words
A process for disinfecting a substrate comprising contacting said substrate with an aqueous solution consisting essentially of from about 0.01% to about 6% by weight of an organic acid, wherein the pK of the organic acid is from about 2.8 to about 4.2, and wherein the organic acid is not lactic or citric acid, and from about 0.0001% to about 0.45% by weight based upon the total weight of said composition of a metal chlorite, such that the chlorite ion concentration in the form of chlorous acid is no more than about 15% by weight of the total amount of chlorite ion concentration.
Claim 14
Dependent Claim
103 words
A process for disinfecting a substrate comprising contacting said substrate with an aqueous solution consisting essentially of from about 0.01% to about 6% by weight of an organic acid, wherein the pK of the organic acid is from about 2.8 to about 4.2, and wherein the organic acid is not lactic or citric acid, and from about 0.0001% to about 0.45% by weight based upon the total weight of said composition of a metal chlorite, such that the chlorite ion concentration in the form of chlorous acid is no more than about 15% by weight of the total amount of chlorite ion concentration.
Claim 15
Dependent Claim
77 words
A process for disinfecting a substrate comprising contacting said substrate with an aqueous solution consisting essentially of from about 0.05% to about 3% by weight of citric acid and from about 0.0001% to about 0.45% by weight based upon the total weight of said composition of a metal chlorite, such that the chlorite ion concentration in the form of chlorous acid is no more than about 15% by weight of the total amount of chlorite ion concentration.
Claim 16
Dependent Claim
77 words
A process for disinfecting a substrate comprising contacting said substrate with an aqueous solution consisting essentially of from about 0.05% to about 3% by weight of citric acid and from about 0.0001% to about 0.45% by weight based upon the total weight of said composition of a metal chlorite, such that the chlorite ion concentration in the form of chlorous acid is no more than about 15% by weight of the total amount of chlorite ion concentration.
Claim 17
Dependent Claim
17 words
The process of any one of claims 11 or 12 wherein the metal chlorite is sodium chlorite.
References Cited (Backward Citations)
US2095092A
Cited
GB496247A
Cited
US2071091A
Cited
US2255694A
Cited
US2253368A
Cited
US2332180A
Cited
US2484637A
Cited
US2550622A
Cited
US2726982A
Cited
US2701782A
Cited
US2842422A
Cited
US3065040A
Cited
GB880507A
Cited
US3186869A
Cited
US3271242A
Cited
US3297578A
Cited
US3386915A
Cited
US3518343A
Cited
US4303546A
Cited
CA959238A
Cited
US3663716A
Cited
US3843548A
Cited
CA965699A
Cited
US3754079A
Cited
DE2329753A1
Cited
US4035483A
Cited
US3950554A
Cited
US4067962A
Cited
US4086333A
Cited
US4104190A
Cited
USRE31779E
Cited
US4330531A
Cited
US4317814A
Cited
US4296102A
Cited
US4296103A
Cited
JPS5818616A
Cited
US4410442A
Cited
US4388204A
Cited
US4507285A
Cited
US4554091A
Cited
US4547381A
Cited
US4585482A
Cited
US4696811A
Cited
US4690772A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-01-21 | 1994-07-23 | 1995-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-21 | 1998-07-23 | 1999-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-21 | 2002-07-23 | 2003-01-22 | $7700.00 | Window Closed / Lapsed |