Patent US5135681A successfully refreshed from Google Patents.
US5135681A
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Substituted carboxymethoxysuccinic acid corrosion inhibitors
Assignee: WR Grace and Co Conn
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Filing: 1991-10-24
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Granted: 1992-08-04
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Expires: 2011-10-24
Abstract
Abstract A method is disclosed for inhibiting corrosion of a ferrous based metal in contact with an aqueous system comprising incorporating into the aqueous system an effective amount of a substituted carboxymethoxysuccinic acid selected from the group consisting of compounds having the formula: ##STR1## wherein R is --(CHOH) n CH 2 OH, --(CHOH) m CO 2 H or --(CHOH) r (CHOR')CO 2 H and R' is CH(CO 2 H)CH 2 CO 2 H; n is 1,2,3 or 4; m is 1,2,3, or 4; r is 1,2, or 3; and water soluble salts thereof.
Inventors
- 👤 Charles G. Carter
- 👤 Vladimir Jovancicevic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:47
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/12; C23F11/124; C23F11/126; C07; C07C; C07C59/00; C07C59/235; C07C59/305
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
40 words
A method of inhibiting corrosion of a ferrous-based metal in contact with an aqueous system which consists essentially of incorporating into the aqueous system, in an amount effective to inhibit corrosion, a substituted carboxymethoxysuccinic acid or water soluble salts thereof.
Claim 2
Independent Claim
40 words
A method of inhibiting corrosion of a ferrous-based metal in contact with an aqueous system which consists essentially of incorporating into the aqueous system, in an amount effective to inhibit corrosion, a substituted carboxymethoxysuccinic acid or water soluble salts thereof.
Claim 3
Dependent Claim
25 words
The method according to claim 1 wherein a concentration of from 0.1 ppm to 1,000 ppm of said compound is maintained in the aqueous system.
Claim 4
Dependent Claim
24 words
The method according to claim 1 wherein a concentration of from 0.5 to 200 ppm of said compound is maintained in the aqueous system.
Claim 5
Dependent Claim
25 words
The method according to claim 1 wherein a concentration of from 0.5 ppm to 100 ppm of said compound is maintained in the aqueous system.
Claim 6
Dependent Claim
72 words
The method according to claim 1 wherein said substituted carboxymethoxysuccinic acid is selected from the group consisting of compounds having the formula: ##STR3## wherein R is --(CHOH) n CH 2 OH, --(CHOH) m CO 2 H or --(CHOH) r (CHOR')CO 2 H and R' is CH(CO 2 H)CH 2 CO 2 H; n is 1,2,3 or 4; m is 1,2,3, or 4; r is 1,2, or 3; and water soluble salts thereof.
Claim 7
Dependent Claim
20 words
The method according to claim 5 where R is --(CHOH) n CH 2 OH and n is 1,2,3 or 4.
Claim 8
Dependent Claim
10 words
The method according to claim 6 wherein n is 3.
Claim 9
Dependent Claim
13 words
The method according to claim 7 wherein said salt is a sodium salt.
Claim 10
Dependent Claim
20 words
The method according to claim 5 wherein R is --(CHOH) n CO 2 H and m is 1,2,3 or 4.
Claim 11
Dependent Claim
10 words
The method according to claim 9 wherein m is 3.
Claim 12
Dependent Claim
13 words
The method according to claim 10 wherein said salt is a sodium salt.
Claim 13
Dependent Claim
14 words
The method according to claim 5 wherein R is --(CHOH) r (CHOR')CO 2 H.
Claim 14
Dependent Claim
10 words
The method according to claim 12 wherein r is 2.
Claim 15
Dependent Claim
13 words
The method according to claim 12 wherein said salt is a sodium salt.
Claim 16
Dependent Claim
13 words
The method according to claim 1 wherein said salts are alkali metal salts.
Claim 17
Dependent Claim
12 words
The method according to claim 15 wherein said salts are sodium salts.
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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) | 1995-08-04 | 1996-02-03 | 1996-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-04 | 2000-02-03 | 2000-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-04 | 2004-02-03 | 2004-08-04 | $7700.00 | Window Closed / Lapsed |