US4495336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mercapto-polycarboxylic acids
Assignee: Baker Petrolite LLC
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Filing: 1982-06-07
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Granted: 1985-01-22
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Expires: 2002-06-07
Abstract
Abstract This invention relates to a sulfidic process of inhibiting corrosion which comprises heating a system with a sulfur-containing polycarboxylic acid or derivatives thereof having carboxylic groups attached to adjacent carbons.
Inventors
- 👤 Rudolf H. Hausler
- 👤 Neil E. S. Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:35
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/04; C09; C09K; C09K8/00; C09K8/54; C23G; C23G1/00; C23G1/02; C23G1/04; C23G1/06; C23G1/065; Y; Y10; Y10S; Y10S507/00; Y10S507/939
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
50 words
A process of inhibiting corrosion which comprises treating a system with a sulfidic sulfur-containing polycarboxylic acid having carboxylic groups attached to adjacent carbons, or a derivative thereof selected from the group consisting of anhydrides, salts, esters, amides, aminoamides, ester amides, polyamides, polyester amides, and cyclic amidines of said carboxylic acid.
Claim 2
Dependent Claim
50 words
A process of inhibiting corrosion which comprises treating a system with a sulfidic sulfur-containing polycarboxylic acid having carboxylic groups attached to adjacent carbons, or a derivative thereof selected from the group consisting of anhydrides, salts, esters, amides, aminoamides, ester amides, polyamides, polyester amides, and cyclic amidines of said carboxylic acid.
Claim 3
Dependent Claim
13 words
The process of claim 1 where the polycarboxylic acid is a dicarboxylic acid.
Claim 4
Dependent Claim
12 words
The process of claim 2 where the dicarboxylic acid is maleic acid.
Claim 5
Dependent Claim
56 words
The process of claim 2 where said sulfidic sulfur-containing dicarboxylic acid or derivative thereof is ##STR39## where R is selected from the group consisting of alkyl, aryl, aralkyl, cycloalkyl, and substituted derivatives thereof, and where A and B are --OH, amido, ester, or where A and B are joined to form an anhydride or imino group.
Claim 6
Dependent Claim
12 words
The process of claim 4 where R has at least 4 carbons.
Claim 7
Dependent Claim
13 words
The process of claim 4 where R has about 6 to 18 carbons.
Claim 8
Dependent Claim
13 words
The process of claim 4 where R has about 8 to 12 carbons.
Claim 9
Dependent Claim
11 words
The process of claim 4 where R is octyl or dodecyl.
Claim 10
Dependent Claim
16 words
The process of claim 9 where at least one group of A and B is OH.
Claim 11
Dependent Claim
14 words
The process of claim 9 where both groups of A and B are OH.
Claim 12
Dependent Claim
65 words
The process of claim 4 where A and B are one of the following: (1) R 1 NR 2 where R 1 and R 2 are hydrogen, or alkyl, or a cycloalkyl group, or where A and B are joined to the nitrogen to form a cycloalkyl group; (2) XR where X is oxygen or sulfur and R is an alkyl or a cycloalkyl group.
Claim 13
Dependent Claim
14 words
The process of claim 9 where the system inhibited is a chemical cleaning solution.
Claim 14
Dependent Claim
14 words
The process of claim 10 where the system inhibited is a chemical cleaning solution.
Claim 15
Dependent Claim
14 words
The process of claim 11 where the system inhibited is a chemical cleaning solution.
Claim 16
Dependent Claim
14 words
The process of claim 11 where the system inhibited is a chemical cleaning solution.
Claim 17
Dependent Claim
15 words
The process of claim 15 where the sulfur-containing compound is ##STR40## where R is alkyl.
Claim 18
Dependent Claim
12 words
The process of claim 16 where the alkyl group has 6-18 carbons.
Claim 19
Dependent Claim
14 words
The process of claim 17 where the alkyl group has 7 to 11 carbons.
Claim 20
Dependent Claim
15 words
The process of claim 1 where the carboxylic groups are attached to a cyclic ring.
Claim 21
Dependent Claim
22 words
The process of claim 19 where the composition has the general formula ##STR41## where ═ indicates ring unsaturation and R is alkyl.
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) | 1988-01-22 | 1988-07-23 | 1989-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-22 | 1992-07-23 | 1993-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-22 | 1996-07-23 | 1997-01-22 | $7700.00 | Window Closed / Lapsed |