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US3640873A
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Corrosion inhibitor system for functional fluids
Assignee: Dow Chemical Co
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Filing: 1969-01-22
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Granted: 1972-02-08
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Expires: 1989-01-22
Abstract
Abstract The SAE corrosion specifications and other SAE specifications for functional fluids are met by the use of an effective amount of an inhibitor system consisting essentially of: 0-81.4% N-DODECYLDIMETHYLAMINE 0-81.4% T-BUTYLAMINE 16.6-98% Phosphite ester of an alkyla ted phenol 1.8-83% Polymerized trimethyl dihydr oquinoline 0.2-9.4% Benzotriazole BY WEIGHT.
Inventors
- 👤 Lowell R Avery
- 👤 Wayne A Conklin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:10
CPC Classifications
C; C10; C10M; C10M3/00; C09; C09K; C09K5/00; C09K5/08; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C10M2207/00; C10M2207/04; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/104; C10M2209/105; C10M2209/106; C10N; C10N2040/00; C10N2040/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
34 words
The functional fluid of claim 1 wherein the corrosion inhibitor composition consists essentially of: 17-56% n-dodecyldimethylamine 17-56% t-butylamine 11-48% Tri(tertiary-amylphenyl) phosphite containing up to 10 weight percent dicyclohexylamine 2-16% Polymerized trimethyl dihydroquinoline 0.5-2.3% Benzotriazole.
Claim 2
Dependent Claim
19 words
The functional fluid of claim 1 wherein the corrosion inhibitor constitutes 0.25 to 5% by weight of the fluid.
Claim 3
Dependent Claim
19 words
The functional fluid of claim 1 wherein the corrosion inhibitor constitutes 0.5 to 1% by weight of the fluid.
Claim 4
Dependent Claim
15 words
The functional fluid of claim 1 wherein the cyclic alkylene carbonate constitutes 0.1 to 30%.
Claim 5
Dependent Claim
32 words
The functional fluid defined in claim 1 wherein 60 to 95% by weight of the fluid is the ether or ester and 3 to 20% by weight is the cyclic alkylene carbonate.
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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |