US4587028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-silicate antifreeze formulations
Assignee: Texaco Inc
•
Filing: 1984-10-15
•
Granted: 1986-05-06
•
Expires: 2004-10-15
Abstract
Abstract Non-silicate, non-gelling corrosion inhibited antifreeze compositions containing a water-soluble liquid alcohol freezing point depressant and an inhibitor combination comprising an alkali metal salt of benzoic acid, an alkali metal salt of a dicarboxylic acid and an alkali metal nitrate are described. These formulations work just as well or better than silicate-based formulations in all regards and have the advantage of not having to contain expensive organo silane gellation inhibitors as do silicate-containing antifreezes. The dicarboxylic acid used preferably has eight to twelve carbon atoms.
Inventors
- 👤 Jerome W. Darden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:30
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/20
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
75 words
A non-silicate, non-gelling corrosion inhibited antifreeze composition comprising a water-soluble liquid alcohol freezing point depressant comprising ethylene glycol and an inhibitor combination comprising. a. about 2 to 5 percent of an alkali metal salt of benzoic acid, b. about 0.5 to 1.5 percent of an alkali metal salt of a dicarboxylic acid having eight to twelve carbon atoms, and c. about 0.1 to 0.5 percent of an alkali metal nitrate in the absence of silicates.
Claim 2
Dependent Claim
75 words
A non-silicate, non-gelling corrosion inhibited antifreeze composition comprising a water-soluble liquid alcohol freezing point depressant comprising ethylene glycol and an inhibitor combination comprising. a. about 2 to 5 percent of an alkali metal salt of benzoic acid, b. about 0.5 to 1.5 percent of an alkali metal salt of a dicarboxylic acid having eight to twelve carbon atoms, and c. about 0.1 to 0.5 percent of an alkali metal nitrate in the absence of silicates.
Claim 3
Dependent Claim
18 words
The antifreeze composition of claim 1 in which the alkali metal salt of benzoic acid is sodium benzoate.
Claim 4
Dependent Claim
18 words
The antifreeze composition of claim 1 in which the alkali metal salt of dicarboxylic acid is sodium sebacate.
Claim 5
Dependent Claim
15 words
The antifreeze composition of claim 1 in which the alkali metal nitrate is sodium nitrate.
Claim 6
Dependent Claim
32 words
The antifreeze composition of claim 1 in which at least one additional ingredient is present which is selected from the group consisting of alkali metal hydroxides, alkali metal nitrites and aromatic azoles.
Claim 7
Dependent Claim
36 words
A process for inhibiting the corrosion of metals which come in contact with an antifreeze composition, which comprises contacting the surface of the metal to be inhibited against corrosion with the antifreeze composition of claim 1.
Claim 8
Dependent Claim
55 words
A non-silicate corrosion inhibited antifreeze composition comprising a water-soluble liquid alcohol freezing point depressant comprising ethylene glycol and an inhibitor combination comprising: a. about 2 to 5 percent of sodium benzoate, b. about 0.5 to 1.5 percent of sodium sebacate, and c. about 0.1 to 0.5 percent of sodium nitrate in the absence of silicates.
Claim 9
Dependent Claim
55 words
A non-silicate corrosion inhibited antifreeze composition comprising a water-soluble liquid alcohol freezing point depressant comprising ethylene glycol and an inhibitor combination comprising: a. about 2 to 5 percent of sodium benzoate, b. about 0.5 to 1.5 percent of sodium sebacate, and c. about 0.1 to 0.5 percent of sodium nitrate in the absence of silicates.
Claim 10
Dependent Claim
32 words
The antifreeze composition of claim 7 in which at least one additional ingredient is present which is selected from the group consisting of alkali metal hydroxides, alkali metal nitrites and aromatic azoles.
Claim 11
Dependent Claim
36 words
A process for inhibiting the corrosion of metals which come in contact with an antifreeze composition, which comprises contacting the surface of the metal to be inhibited against corrosion with the antifreeze composition of claim 7.
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) | 1989-05-05 | 1989-11-04 | 1990-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-05 | 1993-11-04 | 1994-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-05 | 1997-11-04 | 1998-05-06 | $7700.00 | Window Closed / Lapsed |