US4207285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkanolamine salts of maleamic acids as anti-corrosion agents in aqueous systems
Assignee: BASF SE
•
Filing: 1978-12-20
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Granted: 1980-06-10
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Expires: 1998-12-20
Abstract
Abstract A process for preventing the corrosion of metals in aqueous systems by means of low-foam corrosion inhibitors consisting of alkanolamine salts of maleamic acids.
Inventors
- 👤 Knut Oppenlaender
- 👤 Wolfgang Kindscher
- 👤 Elmar Getto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:50
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/14; C23F11/145
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
76 words
A method of preventing corrosion of metals in industrial processes taking place in the presence of water, wherein a mono-, di- or tri-C 2 -- to --C 3 -alkanolamine salt of a maleamic acid of the formula I R-NHCO-CH═CHCOOH I where R is an isoalkyl radical in which the longest chain is of 6 to 8 carbon atoms, whilst the entire radical is of 8 to 12 carbon atoms, is employed as a low-foam corrosion inhibitor.
Claim 2
Independent Claim
76 words
A method of preventing corrosion of metals in industrial processes taking place in the presence of water, wherein a mono-, di- or tri-C 2 -- to --C 3 -alkanolamine salt of a maleamic acid of the formula I R-NHCO-CH═CHCOOH I where R is an isoalkyl radical in which the longest chain is of 6 to 8 carbon atoms, whilst the entire radical is of 8 to 12 carbon atoms, is employed as a low-foam corrosion inhibitor.
Claim 3
Dependent Claim
23 words
A method as claimed in claim 1, wherein from 0.1 to 3% by weight, based on water, of the corrosion inhibitor is employed.
Claim 4
Dependent Claim
26 words
A method as claimed in claim 1, wherein a salt of a maleamic acid of the formula I, where R is isooctyl or isononyl, is employed.
Claim 5
Dependent Claim
41 words
A method as claimed in claim 1, wherein the salt used is mixed with up to 90% by weight, based on the mixture, of compounds of the same formula, where R is a n-alkyl radical of 8 to 12 carbon atoms.
References Cited (Backward Citations)
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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) | 1983-06-10 | 1983-12-10 | 1984-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-10 | 1987-12-10 | 1988-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-10 | 1991-12-10 | 1992-06-10 | $7700.00 | Window Closed / Lapsed |