Patent US4436639A successfully refreshed from Google Patents.
US4436639A
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Ammonium salts of polymaleic acids and use as corrosion inhibitors in water-in-oil emulsions
Assignee: BASF SE
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Filing: 1982-05-10
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Granted: 1984-03-13
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Expires: 2002-05-10
Abstract
Abstract The subject invention relates to salts of polymaleic acids having a molecular weight between 200 and 1500 and to their use in preventing the corrosion of metal caused by hydrogen sulfide and carbon dioxide in water-in-oil emulsions such as crude oil.
Inventors
- 👤 Knut Oppenlaender
- 👤 Karl Stork
- 👤 Klaus Barthold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:29
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/54; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/173; Y; Y10; Y10S; Y10S507/00; Y10S507/939
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
70 words
A polymaleic acid salt obtained by reacting a polymaleic acid having a molecular weight of 200 to 1500 with an amine having the formula ##STR4## in which R 1 and R 2 are the same or different and are H or C 9 -C 20 alkyl or C 9 -C 20 alkenyl radical and R 3 is a C 9 -C 20 alkyl or C 9 -C 20 alkenyl radical.
Claim 2
Dependent Claim
70 words
A polymaleic acid salt obtained by reacting a polymaleic acid having a molecular weight of 200 to 1500 with an amine having the formula ##STR4## in which R 1 and R 2 are the same or different and are H or C 9 -C 20 alkyl or C 9 -C 20 alkenyl radical and R 3 is a C 9 -C 20 alkyl or C 9 -C 20 alkenyl radical.
Claim 3
Dependent Claim
10 words
The salt of claim 1 wherein the amine is mono-iso-tridecylamine.
Claim 4
Dependent Claim
15 words
The salt of claim 1 wherein the acid has a molecular weight of approximately 650.
Claim 5
Dependent Claim
16 words
A water-in-oil emulsion containing from 100 ppm to 10,000 ppm of a salt of claim 1.
Claim 6
Dependent Claim
26 words
The emulsion of claim 4 wherein the salt is the reaction product of a polymaleic acid having a molecular weight of approximately 650 and a mono-iso-tridecylamine.
References Cited (Backward Citations)
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US4018702A
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US4105581A
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US4240925A
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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) | 1987-03-13 | 1987-09-12 | 1988-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-13 | 1991-09-12 | 1992-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-13 | 1995-09-12 | 1996-03-13 | $7700.00 | Window Closed / Lapsed |