US4451376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-functional hypobromide precursors
Assignee: ASSIGNEE NALCO CHEMICAL Co A DE CORP
•
Filing: 1983-07-28
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Granted: 1984-05-29
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Expires: 2003-07-28
Abstract
Abstract An improved method for treating alkaline industrial process waters to control the growth and deposit of microorganisms which comprises adding to such waters a combination of a water-soluble anionic polymeric dispersant having a molecular weight not greater than 50,000 and hypobromous acid, said hypobromous acid having been produced by contacting a solution containing: (a) a water-soluble inorganic bromide, and (b) an anionic polymeric dispersant with a chlorine containing oxidant chosen from the group consisting of an inorganic hypochlorite salt, hypochlorous acid, and chlorine.
Inventors
- 👤 John D. Sharp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:37
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/76; C02F1/766
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
88 words
An improved method for treating alkaline industrial process waters to control the growth and deposit of microorganisms which comprises adding to such waters a combination of a water-soluble anionic polymeric dispersant having a molecular weight not greater than 50,000 and hypobromous acid, said hypobromous acid having been produced by contacting a solution containing both: (a) a water-soluble inorganic bromide, and (b) an anionic polymeric dispersant with a second solution of a chlorine containing oxidant chosen from the group consisting of an inorganic hypochlorite salt, hypochlorous acid, and chlorine.
Claim 2
Dependent Claim
88 words
An improved method for treating alkaline industrial process waters to control the growth and deposit of microorganisms which comprises adding to such waters a combination of a water-soluble anionic polymeric dispersant having a molecular weight not greater than 50,000 and hypobromous acid, said hypobromous acid having been produced by contacting a solution containing both: (a) a water-soluble inorganic bromide, and (b) an anionic polymeric dispersant with a second solution of a chlorine containing oxidant chosen from the group consisting of an inorganic hypochlorite salt, hypochlorous acid, and chlorine.
Claim 3
Dependent Claim
27 words
The improved method of claim 1 where the molecular weight of the anionic polymeric dispersant is less than 20,000 and the inorganic hypochlorite salt is sodium hypochlorite.
Claim 4
Dependent Claim
19 words
The improved method of claim 2 where the anionic polymeric dispersant is a copolymer of sodium acrylate and ethylacrylate.
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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) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |