US4650808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synergistic compositions containing hydroxypropyl methanethiolsulfonate and methods of using same
Assignee: Buckman Laboratories International Inc
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Filing: 1984-03-28
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Granted: 1987-03-17
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Expires: 2004-03-28
Abstract
Abstract Compositions comprising 2-hydroxypropyl methanethiolsulfonate in combination with a mixture of 5-chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one show synergistic results in controlling the growth and proliferation of microorganisms in aqueous systems.
Inventors
- 👤 Oscar W. May
- 👤 Betty S. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:47
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/50; A; A01; A01N; A01N43/00; A01N43/72; A01N43/80
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
73 words
A synergistic bactericidal composition comprising in admixture (a) 2-hydroxypropyl methanethiosulfonate; and (b) a mixture of 5-chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one, wherein the approximate weight ratio of the compounds in the mixture (b) is from about 70 to 80 parts by weight 5-chloro-2-methyl-4-isothiazolin-3-one to about 20 to 30 parts by weight 2-methyl-4-isothiozolin-3-one; and characterized further in that the weight ratio of the thiosulfonate (a) to the isothiazoline mixture (b) ranges from about 95:5 to about 5:95.
Claim 2
Dependent Claim
73 words
A synergistic bactericidal composition comprising in admixture (a) 2-hydroxypropyl methanethiosulfonate; and (b) a mixture of 5-chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one, wherein the approximate weight ratio of the compounds in the mixture (b) is from about 70 to 80 parts by weight 5-chloro-2-methyl-4-isothiazolin-3-one to about 20 to 30 parts by weight 2-methyl-4-isothiozolin-3-one; and characterized further in that the weight ratio of the thiosulfonate (a) to the isothiazoline mixture (b) ranges from about 95:5 to about 5:95.
Claim 3
Dependent Claim
15 words
The composition of claim 1 where said ratio of (a) to (b) is about 87:13.
Claim 4
Dependent Claim
15 words
The composition of claim 1 where said ratio of (a) to (b) is about 90:10.
Claim 5
Dependent Claim
15 words
The composition of claim 1 where said ratio of (a) to (b) is about 50:50.
Claim 6
Dependent Claim
27 words
The composition of claim 1 wherein the approximate weight ratio of the compounds in the mixture (b) is 70 parts of 5-chloro-2-methyl-4-isothiazolin-3-one to 30 parts of 2-methyl-4-isothiazolin-3-one.
Claim 7
Dependent Claim
27 words
The composition of claim 1 wherein the approximate weight ratio of the compounds in the mixture (b) is 75 parts of 5-chloro-2-methyl-4-isothiazolin-3-one to 25 parts of 2-methyl-4-isothiazolin-3-one.
Claim 8
Dependent Claim
27 words
The composition of claim 1 wherein the approximate weight ratio of the compounds in the mixture (b) is 80 parts of 5-chloro-2-methyl-4-isothiazolin-3-one to 20 parts of 2-methyl-4-isothiazolin-3-one.
Claim 9
Dependent Claim
45 words
A method of controlling the growth of bacteria in aqueous systems which comprises adding to the water in such system a composition as defined in claim 1 in an amount between approximately 0.01 and approximately 1000 parts of the composition per million parts of water.
Claim 10
Dependent Claim
19 words
The method of claim 8 in which the aqueous system is that of a pulp and paper mill system.
Claim 11
Dependent Claim
17 words
The method of claim 8 in which the aqueous system is that of a cooling water system.
Claim 12
Dependent Claim
20 words
The method of claim 8 in which the aqueous system is that of a petroleum enhanced oil recovery waterflood system.
Claim 13
Dependent Claim
30 words
The synergistic bactericidal composition of claim 2, wherein said composition is synergistic against at least one bacterium selected from the group consisting of Enterobacter aerogenes, Psuedomonas aeruginosa and Sphaerotilus natans.
Claim 14
Dependent Claim
15 words
The synergistic bactericidal composition of claim 12, wherein said composition is synergistic against Enterobacter aerogenes.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-03-16 | 1990-09-15 | 1991-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-16 | 1994-09-15 | 1995-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-16 | 1998-09-15 | 1999-03-17 | $7700.00 | Window Closed / Lapsed |