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US4234511A
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Dialkylamino-N,N-bis(phosphonoalkylene)alkylamines and use in aqueous systems as precipitation and corrosion inhibitors
Assignee: Buckman Laboratories International Inc
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Filing: 1979-07-26
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Granted: 1980-11-18
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Expires: 1999-07-26
Abstract
Abstract Dialkylamino-N,N-bis(phosphonoalkylene)alkylamines, salts, and specifically the hydrochlorides thereof prepared by reacting an unsymmetrical dimethylaminoalkylamine hydrochloride with phosphorous acid and an aldehyde are useful in various industrial processes including acting as corrosion and scale inhibitors in aqueous systems wherein such corrosion and scale problems exist. Quaternized dialkylamino-N,N-bis(phosphonoalkylene)alkylamines suitable for the same uses are prepared by the treatment of an aqueous solution of a dialkylamine-N,N-bis(phosphonoalkylene)alkylamine with an epoxide or a halohydrin.
Inventors
- 👤 John D. Buckman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:56
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/167; C23F11/1676; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3808; C07F9/3817
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
67 words
As a new composition of matter a compound having the formula ##STR4## wherein R 1 and R 2 represent an alkyl group containing 1 to 4 carbon atoms, R 3 and R 4 represent hydrogen or an alkyl group containing 1 to 4 carbon atoms, M represents hydrogen, alkali metal or ammonium, and n is an integer varying from 2 to 6 and the hydrochloride salts thereof.
Claim 2
Dependent Claim
67 words
As a new composition of matter a compound having the formula ##STR4## wherein R 1 and R 2 represent an alkyl group containing 1 to 4 carbon atoms, R 3 and R 4 represent hydrogen or an alkyl group containing 1 to 4 carbon atoms, M represents hydrogen, alkali metal or ammonium, and n is an integer varying from 2 to 6 and the hydrochloride salts thereof.
Claim 3
Dependent Claim
10 words
The compound according to claim 1 identified as 2-(N,N-dimethylamino)-N',N'-bis(phosphonomethyl)ethylamine hydrochloride.
Claim 4
Dependent Claim
12 words
The compound according to claim 1 wherein M is an alkali metal.
Claim 5
Dependent Claim
12 words
The compound according to claim 1 wherein M is NH 4 .
Claim 6
Dependent Claim
10 words
The compound according to claim 1 identified as 3-(N,N-dimethylamino)-N',N'-bis(phosphonomethyl)propylamine hydrochloride.
References Cited (Backward Citations)
US2599807A
Cited
US2841611A
Cited
US2964549A
Cited
US3160632A
Cited
US3288846A
Cited
US4054598A
Cited
US4064164A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-18 | 1984-05-19 | 1984-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-18 | 1988-05-19 | 1988-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-18 | 1992-05-19 | 1992-11-18 | $7700.00 | Window Closed / Lapsed |