US4370199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Enzymatic catalyzed biocide system
Assignee: WESTVACO Corp A CORP OF DE
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Filing: 1981-11-09
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Granted: 1983-01-25
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Expires: 2001-11-09
Abstract
Abstract A method of killing and inhibiting the growth of microorganisms in industrial process streams comprises the addition of an enzymatically catalyzed biocide system utilizing a microbial or plant dehydrogenase enzyme such as peroxidase or laccase in the presence of an oxidant such as hydrogen peroxide or oxygen to oxidize halide salts, or phenolic compounds found in or added to the process streams to produce oxidation products that are toxic to microorganisms.
Inventors
- 👤 Steve A. Orndorff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:06
CPC Classifications
D; D21; D21C; D21C5/00; D21C5/005; A; A01; A01N; A01N63/00; A01N63/50; Y; Y10; Y10S; Y10S210/00; Y10S210/928
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
92 words
The method of controlling the growth of slime in a pulp and paper mill process stream comprising adding to the stream an effective amount of an enzymatic biocide comprising a plant or microbial dehydrogenase enzyme selected from the group consisting of peroxidase and laccase, an oxidant selected from the group consisting of hydrogen peroxide and oxygen and an oxidizable substrate selected from the group consisting of black liquor, acid lignin, catechol, guaiacol, resorcinol or a halide salt, wherein the oxidizable substrate is oxidized to produce oxidation products which are toxic to microorganisms.
Claim 2
Independent Claim
92 words
The method of controlling the growth of slime in a pulp and paper mill process stream comprising adding to the stream an effective amount of an enzymatic biocide comprising a plant or microbial dehydrogenase enzyme selected from the group consisting of peroxidase and laccase, an oxidant selected from the group consisting of hydrogen peroxide and oxygen and an oxidizable substrate selected from the group consisting of black liquor, acid lignin, catechol, guaiacol, resorcinol or a halide salt, wherein the oxidizable substrate is oxidized to produce oxidation products which are toxic to microorganisms.
Claim 3
Dependent Claim
26 words
The method of claim 1 wherein the enzymatic biocide is effective against bacteria from the group consisting of aerobic bacteria, facultative anaerobic bacteria, and anaerobic bacteria.
Claim 4
Independent Claim
94 words
The method of killing and controlling the growth of microorganisms in an industrial process stream containing or having added thereto an oxidizable substrate selected from the group consisting of black liquor lignin derived phenolics comprising, adding to the stream an effective amount of an enzymatic biocide comprising a plant or microbial dehydrogenase enzyme selected from the group consisting of peroxidase and laccase and an oxidant selected from the group consisting of hydrogen peroxide and oxygen, wherein the black liquor and lignin derived phenolics are oxidized to produce oxidation products which are toxic to microorganisms.
Claim 5
Independent Claim
94 words
The method of killing and controlling the growth of microorganisms in an industrial process stream containing or having added thereto an oxidizable substrate selected from the group consisting of black liquor lignin derived phenolics comprising, adding to the stream an effective amount of an enzymatic biocide comprising a plant or microbial dehydrogenase enzyme selected from the group consisting of peroxidase and laccase and an oxidant selected from the group consisting of hydrogen peroxide and oxygen, wherein the black liquor and lignin derived phenolics are oxidized to produce oxidation products which are toxic to microorganisms.
Claim 6
Dependent Claim
27 words
The method of claim 3 wherein the biocide treatment is performed at a pH of from about 4-11 and a temperature of from about 10-60 degrees C.
Claim 7
Dependent Claim
31 words
The method of claim 4 wherein the quantities of enzyme and oxidant added to the stream is sufficient to oxidize all of the oxidizable substrate material contained in the process stream.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-24 | 1986-07-26 | 1987-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-24 | 1990-07-26 | 1991-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-24 | 1994-07-26 | 1995-01-25 | $7700.00 | Window Closed / Lapsed |