US4426309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antifreeze corrosion inhibitor composition for aluminum engines
Assignee: OLD WORLD TRADING COMPANY Inc (OLD WORLD)
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Filing: 1983-03-10
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Granted: 1984-01-17
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Expires: 2003-03-10
Abstract
Abstract An antifreeze composition for use in aluminum internal combustion engines is disclosed. It is comprised of 0.07 percent to 0.35 percent nitrate, 0.04 percent to 0.08 percent silicate, 0.05 percent to 0.25 percent tolyltriazole, benzotriazole or a mixture thereof, 0.2 percent to 1.5 percent borate, and 0.2 percent to 0.75 percent phosphate.
Inventors
- 👤 Michael L. Abel
- 👤 Thomas P. Yates
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:07
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A method for providing corrosion inhibition in aluminum-containing internal combustion engines which utilize a polyhydroxyalcohol-based coolant, comprising adding to said coolant: (a) from about 0.07% to about 0.35% nitrate, (b) from about 0.04% to about 0.08% silicate, (c) from about 0.05% to about 0.25% of a compound selected from a group consisting of tolyltriazole, benzotriazole, and mixtures thereof, (d) from about 0.2% to about 1.5% borate, and (e) from about 0.2% to about 0.75% phosphate, wherein the cations are selected from the group consisting of sodium, potassium, and mixtures thereof and wherein the pH of the composition is from about 9 to about 11.5.
Claim 2
Independent Claim
104 words
A method for providing corrosion inhibition in aluminum-containing internal combustion engines which utilize a polyhydroxyalcohol-based coolant, comprising adding to said coolant: (a) from about 0.07% to about 0.35% nitrate, (b) from about 0.04% to about 0.08% silicate, (c) from about 0.05% to about 0.25% of a compound selected from a group consisting of tolyltriazole, benzotriazole, and mixtures thereof, (d) from about 0.2% to about 1.5% borate, and (e) from about 0.2% to about 0.75% phosphate, wherein the cations are selected from the group consisting of sodium, potassium, and mixtures thereof and wherein the pH of the composition is from about 9 to about 11.5.
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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) | 1987-01-16 | 1987-07-18 | 1988-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-16 | 1991-07-18 | 1992-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-16 | 1995-07-18 | 1996-01-17 | $7700.00 | Window Closed / Lapsed |