US4592853A
Expired / Lapsed
US
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Dicyclopentadiene dicarboxylic acid salts as corrosion inhibitors
Assignee: Texaco Inc
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Filing: 1985-05-08
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Granted: 1986-06-03
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Expires: 2005-05-08
Abstract
Abstract A corrosion inhibited antifreeze composition incorporating a corrosion inhibitor is described. Six dibasic salts of dicyclopentadiene dicarboxylic acid and optionally a triazole comprise the corrosion inhibitor.
Inventors
- 👤 Jerome W. Darden
- 👤 Edward E. McEntire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:34
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/12; C23F11/124; C09; C09K; C09K5/00; C09K5/20
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
51 words
A corrosion inhibited antifreeze composition comprising a water-soluble liquid alcohol freezing point depressant and an effective amount of an inhibitor comprising: a dibasic acid salt selected from the group consisting of the alkali metal salts of: hexahydro-4,7-Methanoindene-1,5-dicarboxylic acid, hexahydro-4,7-Methanoindene-1,6-dicarboxylic acid, hexahydro-4,7-Methanoindene-3,5-dicarboxylic acid, hexahydro-4,7-Methanoindene-3,6-dicarboxylic acid, hexahydro-4,7-Methanoindene-2,5-dicarboxylic acid, hexahydro-4,7-Methanoindene-2,6-dicarboxylic acid and mixtures thereof.
Claim 2
Dependent Claim
51 words
A corrosion inhibited antifreeze composition comprising a water-soluble liquid alcohol freezing point depressant and an effective amount of an inhibitor comprising: a dibasic acid salt selected from the group consisting of the alkali metal salts of: hexahydro-4,7-Methanoindene-1,5-dicarboxylic acid, hexahydro-4,7-Methanoindene-1,6-dicarboxylic acid, hexahydro-4,7-Methanoindene-3,5-dicarboxylic acid, hexahydro-4,7-Methanoindene-3,6-dicarboxylic acid, hexahydro-4,7-Methanoindene-2,5-dicarboxylic acid, hexahydro-4,7-Methanoindene-2,6-dicarboxylic acid and mixtures thereof.
Claim 3
Dependent Claim
10 words
The composition of claim 1 which additionally comprises a triazole.
Claim 4
Dependent Claim
33 words
The composition of claim 2 wherein the dibasic acid salt is in an amount of 2 to 6 wt % and the triazole is in an amount of 0.1 to 1.0 wt %.
Claim 5
Dependent Claim
20 words
The composition of claim 1 wherein the alkali metal is selected from the group consisting of sodium, potassium and lithium.
Claim 6
Dependent Claim
20 words
The composition of claim 2 wherein the triazole is selected from the group consisting of tolyltriazole, benzotriazole and sodium mercaptobenzothiazole.
Claim 7
Dependent Claim
15 words
The composition of claim 1 wherein the liquid alcohol freezing point depressant is ethylene glycol.
Claim 8
Dependent Claim
9 words
The composition of claim 1 which additionally comprises water.
Claim 9
Dependent Claim
51 words
A corrosion inhibited antifreeze composition comprising a water soluble liquid alcohol freezing point depressant and an effective amount of an inhibitor comprising: a dibasic acid salt selected from the group consisting of the amine salts of: hexahydro-4,7-Methanoindene-1,5-dicarboxylic acid, hexahydro-4,7-Methanoindene-1,6-dicarboxylic acid, hexahydro-4,7-Methanoindene-3,5-dicarboxylic acid, hexahydro-4,7-Methanoindene-3,6-dicarboxylic acid, hexahydro-4,7-Methanoindene-2,5-dicarboxylic acid, hexahydro-4,7-Methanoindene-2,6-dicarboxylic acid and mixtures thereof.
Claim 10
Dependent Claim
51 words
A corrosion inhibited antifreeze composition comprising a water soluble liquid alcohol freezing point depressant and an effective amount of an inhibitor comprising: a dibasic acid salt selected from the group consisting of the amine salts of: hexahydro-4,7-Methanoindene-1,5-dicarboxylic acid, hexahydro-4,7-Methanoindene-1,6-dicarboxylic acid, hexahydro-4,7-Methanoindene-3,5-dicarboxylic acid, hexahydro-4,7-Methanoindene-3,6-dicarboxylic acid, hexahydro-4,7-Methanoindene-2,5-dicarboxylic acid, hexahydro-4,7-Methanoindene-2,6-dicarboxylic acid and mixtures thereof.
Claim 11
Dependent Claim
10 words
The composition of claim 8 which additionally comprises a triazole.
Claim 12
Dependent Claim
33 words
The composition of claim 9 wherein the dibasic acid salt is in an amount of 2 to 6 wt % and the triazole is in an amount of 0.1 to 1.0 wt %.
Claim 13
Dependent Claim
10 words
The composition of claim 8 wherein the amine is triethanolamine.
Claim 14
Dependent Claim
20 words
The composition of claim 9 wherein the triazole is selected from the group consisting of tolyltriazole, benzotriazole and sodium mercaptobenzothiazole.
Claim 15
Dependent Claim
15 words
The composition of claim 8 wherein the liquid alcohol freezing point depressant is ethylene glycol.
Claim 16
Dependent Claim
9 words
The composition of claim 8 which additionally comprises water.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-02 | 1989-12-02 | 1990-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-02 | 1993-12-02 | 1994-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-02 | 1997-12-02 | 1998-06-03 | $7700.00 | Window Closed / Lapsed |