US4684469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two component biocidal process
Assignee: Ecolab Inc
•
Filing: 1986-09-11
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Granted: 1987-08-04
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Expires: 2006-09-11
Abstract
Abstract A method of use of a two component biocidal preparation suitable for controlling slime, microbial organisms such as bacteria, and fungi in industrial waters is disclosed. The preparation includes a biocide and a polysaccharide degrading enzyme effective against those polysaccharides typically found in industrial waters.
Inventors
- 👤 Daniel E. Pedersen
- 👤 Herbert J. Hatcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:41
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/02; D21H21/04; A; A01; A01N; A01N63/00; A01N63/50; C; C02; C02F; C02F1/00; C02F1/50; C02F3/00; C02F3/34; C02F3/342; Y; Y10; Y10S; Y10S210/00; Y10S210/928
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
129 words
A method to substantially increase the antimicrobial activity of a biocide comprising combining in an industrial water stream a biocide selected from the group consisting of a quaternary ammonium compound, a bromopropionamide, a nitrilopropionamide, a chlorophenate, a benzothiazol, a thiocyanate, a thiocarbamate, and mixtures thereof; and an amount of a polysaccharide-degrading enzyme effective to cooperate with the biocide to substantially increase the antimicrobial activity of the biocide against polysaccharide-producing bacteria, wherein the biocide is intermittently added to the industrial water to maintain a concentration of about 1 to 600 ppm, and wherein the concentration of the enzyme is monitored, and maintained at a level of at least about 2 ppm, said enzyme being derived from a preparation having an enzyme activity of at least about 500 units per milliter.
Claim 2
Independent Claim
129 words
A method to substantially increase the antimicrobial activity of a biocide comprising combining in an industrial water stream a biocide selected from the group consisting of a quaternary ammonium compound, a bromopropionamide, a nitrilopropionamide, a chlorophenate, a benzothiazol, a thiocyanate, a thiocarbamate, and mixtures thereof; and an amount of a polysaccharide-degrading enzyme effective to cooperate with the biocide to substantially increase the antimicrobial activity of the biocide against polysaccharide-producing bacteria, wherein the biocide is intermittently added to the industrial water to maintain a concentration of about 1 to 600 ppm, and wherein the concentration of the enzyme is monitored, and maintained at a level of at least about 2 ppm, said enzyme being derived from a preparation having an enzyme activity of at least about 500 units per milliter.
Claim 3
Dependent Claim
10 words
The process of claim 1 wherein the biocide is methylene-bis-thiocyanate.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein the biocide is dimethyl dithiocarbamate.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein the biocide is disodium ethylene-bis-dithiocarbamate.
Claim 6
Dependent Claim
11 words
The process of claim 1 wherein the enzyme is an amylase.
Claim 7
Dependent Claim
13 words
The process of claim 1 wherein the enzyme is a dextran degrading enzyme.
Claim 8
Dependent Claim
12 words
The process of claim 1 wherein the enzyme is a levan hydrolase.
Claim 9
Dependent Claim
20 words
The process of claim 7 wherein the temperature of the industrial water is from about 75° to about 150° F.
Claim 10
Dependent Claim
39 words
The process of claim 1 wherein the industrial water comprises a white water of a paper making process, and the biocide is added to the white water in an amount which will not adversely affect the paper making process.
Claim 11
Dependent Claim
25 words
The process of claim 1 wherein the enzyme is added to the industrial water prior to the addition of any significant amount of the biocide.
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) | 1990-08-03 | 1991-02-02 | 1991-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-03 | 1995-02-02 | 1995-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-03 | 1999-02-02 | 1999-08-04 | $7700.00 | Window Closed / Lapsed |