US4297224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the control of biofouling in recirculating water systems
Assignee: Great Lakes Chemical Corp
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Filing: 1980-06-04
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Granted: 1981-10-27
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Expires: 2000-06-04
Abstract
Abstract Biofouling in recirculating water systems may be controlled by admixing or otherwise providing 1-bromo-3-chloro-5, 5-dimethylhydantoin ("BCDMH") to the water at a level effective to control biological film-forming organisms and thereafter maintaining the BCDMH concentration at a level sufficient substantially to inhibit regrowth of such organisms.
Inventors
- 👤 Nick T. Macchiarolo
- 👤 Billy G. McGuire
- 👤 John M. Scalise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:45
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/50; Y; Y02; Y02W; Y02W10/00; Y02W10/30; Y02W10/37
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
83 words
A method of controlling biofouling in recirculating water systems for heat exchange systems without disinfecting the bulk recirculating water comprising the steps of: introducing a biocidally effective amount of 1-bromo-3-chloro-5,5-dimethylhydantoin into the water in order to kill biofouling microorganisms at film-forming surfaces of the system; and thereafter maintaining the concentration of 1-bromo-3-chloro-5,5-dimethylhydantoin at a level effective to inhibit regrowth of such microorganisms at such surfaces without maintaining a continuous measurable halogen residual in the recirculating water and without disinfecting the bulk recirculating water.
Claim 2
Independent Claim
83 words
A method of controlling biofouling in recirculating water systems for heat exchange systems without disinfecting the bulk recirculating water comprising the steps of: introducing a biocidally effective amount of 1-bromo-3-chloro-5,5-dimethylhydantoin into the water in order to kill biofouling microorganisms at film-forming surfaces of the system; and thereafter maintaining the concentration of 1-bromo-3-chloro-5,5-dimethylhydantoin at a level effective to inhibit regrowth of such microorganisms at such surfaces without maintaining a continuous measurable halogen residual in the recirculating water and without disinfecting the bulk recirculating water.
Claim 3
Dependent Claim
30 words
A method, as claimed in claim 1, wherein the 1-bromo-3-chloro-5,5-dimethylhydantoin is introduced at a daily level of at least about 0.005 pound per thousand gallons of water in the system.
Claim 4
Dependent Claim
28 words
A method, as claimed in claim 1, wherein the 1-bromo-3-chloro-5,5-dimethylhydantoin is provided at a daily level of about 0.01-0.02 pound per thousand gallons of water in the system.
Claim 5
Dependent Claim
15 words
A method, as claimed in claim 1, wherein the 1-bromo-3-chloro-5,5-dimethylhydanotoin is introduced in agglomerate form.
Claim 6
Dependent Claim
16 words
A method, as claimed in claim 1, wherein the recirculating water system is a cooling tower.
Claim 7
Dependent Claim
16 words
A method, as claimed in claim 1, wherein the recirculating water system is an air-conditioning system.
References Cited (Backward Citations)
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US4119535A
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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) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |