US4221660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for disinfecting
Assignee: STWB Inc
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Filing: 1979-01-29
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Granted: 1980-09-09
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Expires: 1999-01-29
Abstract
Abstract A method for disinfecting an aqueous system which comprises contacting the system with a solid aromatic percarboxylic acid having solubility in water not greater than about 1 weight-percent in a weight-percent amount in excess of said solubility in water; and a method for disinfecting materials with said aqueous system.
Inventors
- 👤 Heinz Eggensperger
- 👤 Wolfgang Beilfuss
- 👤 Wolfgang Zerling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:26
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/722; A; A01; A01N; A01N37/00; A01N37/16; A01N37/18; A01N37/30; A01N37/34; A01N37/36; A01N37/38; A01N37/40; A01N37/42; A01N37/44; A01N41/00; A01N41/02; A01N41/04; C02F1/50
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
167 words
A method for disinfecting an aqueous system contaminated with bacteria and/or fungi which comprises contacting the aqueous system with at least one solid aromatic percarboxylic acid having the formula ##STR2## where R 1 and R 2 independently represent hydrogen or a radical selected from the group consisting of chloro, bromo, fluoro, nitro, cyano, trifluoromethyl, carboxyl, methoxycarbonyl, aminocarbonyl, alkyl having from 1 to 5 carbon atoms, phenyl, methoxy, ethoxy, acetoxy, acetyl and hydroxysulfonyl; and R 3 is a radical selected from the group consisting of those defined for R 1 and R 2 ; or R 2 and R 3 when taken together and attached to adjacent carbon atoms form, together with the ring to which they are attached, a naphthalene ring; where the solid aromatic percarboxylic acid has a solubility weight for weight in water not greater than about 1% and where the aqueous system is contacted with a weight-percent amount of the aromatic percarboxylic acid which is in excess of its solubility in the aqueous system.
Claim 2
Independent Claim
167 words
A method for disinfecting an aqueous system contaminated with bacteria and/or fungi which comprises contacting the aqueous system with at least one solid aromatic percarboxylic acid having the formula ##STR2## where R 1 and R 2 independently represent hydrogen or a radical selected from the group consisting of chloro, bromo, fluoro, nitro, cyano, trifluoromethyl, carboxyl, methoxycarbonyl, aminocarbonyl, alkyl having from 1 to 5 carbon atoms, phenyl, methoxy, ethoxy, acetoxy, acetyl and hydroxysulfonyl; and R 3 is a radical selected from the group consisting of those defined for R 1 and R 2 ; or R 2 and R 3 when taken together and attached to adjacent carbon atoms form, together with the ring to which they are attached, a naphthalene ring; where the solid aromatic percarboxylic acid has a solubility weight for weight in water not greater than about 1% and where the aqueous system is contacted with a weight-percent amount of the aromatic percarboxylic acid which is in excess of its solubility in the aqueous system.
Claim 3
Dependent Claim
51 words
A method according to claim 1 wherein the aromatic percarboxylic acid is selected from the group consisting of 4-cyanoperbenzoic acid, 4-tert-butylperbenzoic acid, 3-tert-butylperbenzoic acid, 2-tert-butylperbenzoic acid, 4-nitroperbenzoic acid, 4-fluoroperbenzoic acid, 3-chloroperbenzoic acid, 2,4-dichloroperbenzoic acid, 4-chloroperbenzoic acid, 4-methoxyperbenzoic acid, 2-methylperbenzoic acid, 3-methylperbenzoic acid, 4-methylperbenzoic acid, 3,4,5-trimethoxyperbenzoic acid, monoperphthalic acid and pernaphthoic acid.
Claim 4
Dependent Claim
27 words
A method according to claim 2 wherein the aromatic percarboxylic acid is selected from the group consisting of 4-tert-butylperbenzoic acid, 3-chloroperbenzoic acid, 4-methylperbenzoic acid and 4-methoxyperbenzoic acid.
References Cited (Backward Citations)
US3072524A
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GB886188A
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US3100175A
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US3332871A
Cited
US3488420A
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Cited
GB1465727A
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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) | 1983-09-09 | 1984-03-10 | 1984-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-09 | 1988-03-10 | 1988-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-09 | 1992-03-10 | 1992-09-09 | $7700.00 | Window Closed / Lapsed |