US4018592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of controlling the growth of algae
Assignee: Buckman Laboratories International Inc
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Filing: 1975-07-21
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Granted: 1977-04-19
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Expires: 1995-07-21
Abstract
Abstract Poly[2-hydroxyethylene(dimethyliminio)ethylene(dimethyliminio)methylene dichloride] prepared by the reaction of N, N, N', N'-tetramethylethylenediamine with hydrochloric acid and epichlorohydrin is useful as an algicide.
Inventors
- 👤 Stanley J. Buckman
- 👤 Gerald D. Mercer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:36
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/02; C08G73/0206; C08G73/0213; C08G73/0226; C02; C02F; C02F1/00; C02F1/50
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
63 words
A method of inhibiting the growth of algae in an aqueous system which comprises contacting said algae with a polymer having the formula and name: ##STR2## (Poly [2-hydroxyethylene(dimethyliminio)ethylene(dimethyliminio)methylene dichloride])-prepared by reacting epichlorohydrin and hydrochloric acid with N,N,N',N'- tetramethylethylenediamine in an aqueous medium wherein n is an integer varying from 4 to 40 in an amount sufficient to inhibit the growth of said algae.
Claim 2
Independent Claim
63 words
A method of inhibiting the growth of algae in an aqueous system which comprises contacting said algae with a polymer having the formula and name: ##STR2## (Poly [2-hydroxyethylene(dimethyliminio)ethylene(dimethyliminio)methylene dichloride])-prepared by reacting epichlorohydrin and hydrochloric acid with N,N,N',N'- tetramethylethylenediamine in an aqueous medium wherein n is an integer varying from 4 to 40 in an amount sufficient to inhibit the growth of said algae.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein the polymer has a molecular weight varying from 800 to 10,000.
Claim 4
Dependent Claim
38 words
The method of inhibiting the growth of algae in cooling towers which comprises adding to the water in said cooling tower the polymer defined in claim 1 in an amount sufficient to inhibit the growth of said algae.
Claim 5
Dependent Claim
38 words
The method of inhibiting the growth of algae in holding ponds which comprises adding to the water in said holding ponds the polymer defined in claim 1 in an amount sufficient to inhibit the growth of said algae.
Claim 6
Dependent Claim
38 words
The method of inhibiting the growth of algae in swimming pools which comprises adding to the water in said swimming pools the polymer defined in claim 1 in an amount sufficient to inhibit the growth of said algae.
References Cited (Backward Citations)
US3771989A
Cited
US3943255A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |