US4561990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High lead solder corrosion inhibitors
Assignee: Texaco Inc
•
Filing: 1984-10-04
•
Granted: 1985-12-31
•
Expires: 2004-10-04
Abstract
Abstract The use of dicarboxylic acids or the salts thereof in aqueous solutions to prevent the corrosion of high lead solders contacted thereby is described. These materials are particularly useful in phosphate-based antifreezes. Particularly preferred is the combination of a dicarboxylic acid and an alkali metal molybdate. This mixture gives greater corrosion protection to high lead solder than either component alone.
Inventors
- 👤 Jerome W. Darden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:01
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C09; C09K; C09K5/00; C09K5/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
66 words
A corrosion-preventing mixture comprising a. a dicarboxylic acid component selected from the group consisting of at least one dicarboxylic acid comprising 8 to 12 carbon atoms and at least one alkali metal salt of a dicarboxylic acid comprising 8 to 12 carbon atoms and b. at least one alkali metal molybdate in a weight ratio of dicarboxylic acid component to alkali metal molybdate of about 2:1.
Claim 2
Dependent Claim
66 words
A corrosion-preventing mixture comprising a. a dicarboxylic acid component selected from the group consisting of at least one dicarboxylic acid comprising 8 to 12 carbon atoms and at least one alkali metal salt of a dicarboxylic acid comprising 8 to 12 carbon atoms and b. at least one alkali metal molybdate in a weight ratio of dicarboxylic acid component to alkali metal molybdate of about 2:1.
Claim 3
Dependent Claim
23 words
The corrosion-preventing mixture of claim 1 in which the dicarboxylic acid component is sebacic acid and the alkali metal molybdate is sodium molybdate.
Claim 4
Dependent Claim
93 words
A corrosion-protected antifreeze composition comprising a. a glycol component selected from the group consisting of an alkylene glycol, an alkylene glycol ether and mixtures thereof, and b. a corrosion-preventing mixture comprising (1) a dicarboxylic acid component selected from the group consisting of at least one dicarboxylic acid comprising 8 to 12 carbon atoms and at least one alkali metal salt of a dicarboxylic acid comprising 8 to 12 carbon atoms, and (2) at least one alkali metal molybdate in a weight ratio of dicarboxylic acid component to alkali metal molybdate of about 2:1.
Claim 5
Dependent Claim
93 words
A corrosion-protected antifreeze composition comprising a. a glycol component selected from the group consisting of an alkylene glycol, an alkylene glycol ether and mixtures thereof, and b. a corrosion-preventing mixture comprising (1) a dicarboxylic acid component selected from the group consisting of at least one dicarboxylic acid comprising 8 to 12 carbon atoms and at least one alkali metal salt of a dicarboxylic acid comprising 8 to 12 carbon atoms, and (2) at least one alkali metal molybdate in a weight ratio of dicarboxylic acid component to alkali metal molybdate of about 2:1.
Claim 6
Dependent Claim
14 words
The antifreeze composition of claim 3 in which the glycol component is ethylene glycol.
Claim 7
Dependent Claim
28 words
The antifreeze composition of claim 3 in which the corrosion-preventing mixture is present in a proportion ranging from about 0.1 to 1.1 wt.% based on the glycol component.
Claim 8
Dependent Claim
23 words
The antifreeze composition of claim 3 in which the dicarboxylic acid component is sebacic acid and the alkali metal molybdate is sodium molybdate.
References Cited (Backward Citations)
US2147395A
Cited
US2147409A
Cited
US2726215A
Cited
US3931029A
Cited
US4382008A
Cited
FR2489355A1
Cited
EP0077767A1
Cited
US4402847A
Cited
US4452715A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-30 | 1989-07-01 | 1989-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-30 | 1993-07-01 | 1993-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-30 | 1997-07-01 | 1997-12-31 | $7700.00 | Window Closed / Lapsed |