Patent US4192744A successfully refreshed from Google Patents.
US4192744A
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Treatment of aqueous systems
Assignee: FMC Corp
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Filing: 1977-10-28
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Granted: 1980-03-11
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Expires: 1997-10-28
Abstract
Abstract Aqueous compositions containing compounds having the formula: ##STR1## wherein R is a straight- or branched alkyl residue containing 11 to 17 carbon atoms and X and Y are the same or different and each is an alkali metal, an alkaline earth metal, ammonium, an amine radical or hydrogen for selectively flocculating iron ions.
Inventors
- 👤 David R. Clark
- 👤 Alan Marshall
- 👤 Michael A. Finan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:30
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/12; C02F1/00; C02F1/52; C02F1/5272; C02F1/72; C02F1/725
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
73 words
A method of treating an aqueous system to flocculate dispersed Fe 2 O 3 (hydrated) selectively therefrom which comprises adding to the aqueous system from 0.1 to 500 ppm, based on the water to be treated, of a compound having the formula I ##STR5## wherein R is n-undecyl and X and Y are the same or different and each is an alkali metal, an alkaline earth metal, ammonium, an amine radical or hydrogen.
Claim 2
Independent Claim
73 words
A method of treating an aqueous system to flocculate dispersed Fe 2 O 3 (hydrated) selectively therefrom which comprises adding to the aqueous system from 0.1 to 500 ppm, based on the water to be treated, of a compound having the formula I ##STR5## wherein R is n-undecyl and X and Y are the same or different and each is an alkali metal, an alkaline earth metal, ammonium, an amine radical or hydrogen.
Claim 3
Dependent Claim
23 words
A method according to claim 1 wherein X and Y are independently selected from the group consisting of sodium, potassium and ammonium radical.
Claim 4
Dependent Claim
33 words
A method as claimed in claim 1, wherein the amount of the compound of formula I is within the range of from 2 to 100 ppm, based on the water to be treated.
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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) | 1983-03-11 | 1983-09-10 | 1984-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-11 | 1987-09-10 | 1988-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-11 | 1991-09-10 | 1992-03-11 | $7700.00 | Window Closed / Lapsed |