Compositions – Heat-exchange – low-freezing or pour point – or high boiling... – Organic components
Reexamination Certificate
2004-01-12
2008-08-05
Ogden, Necholus (Department: 1796)
Compositions
Heat-exchange, low-freezing or pour point, or high boiling...
Organic components
C252S074000, C252S075000, C252S076000, C252S077000, C252S079000
Reexamination Certificate
active
07407599
ABSTRACT:
The present invention relates to a carboxylic acid based antifreeze coolant formulation for heavy duty applications such as for diesel engines which may be used for inhibition and prevention erosion and corrosion of aluminum and the corrosion of other metals exposed to an aqueous liquid in automotive coolant systems. The formulation further inhibits mineral scale. It may be packaged as an ethylene glycol based additive for use in new engines or in a concentrated inhibition package as an additive as for reinhibition of used coolant. The combination of a mixture of ethylene or propylene glycol, a monobasic carboxylic organic acid, azoles, low levels of molybdates, a nitrite salt and/or nitrate salt and/or siloxane stabilized silicate, and combinations thereof, polyvinylpyrrolidone, provide a synergistic protective effect against the cavitation corrosion of aluminum in aqueous liquids reducing the corrosion rate and is effective at relatively low concentrations and varying pH ranges.
REFERENCES:
patent: 4354002 (1982-10-01), Davis et al.
patent: 4402847 (1983-09-01), Wilson et al.
patent: 4725405 (1988-02-01), Cassin et al.
patent: 5269956 (1993-12-01), Miller et al.
Coffey, Jr. Arnold L.
Dituro Michael
Olsen Alden W.
Stephens Carl R.
Turcotte David E.
Ashland Licensingaand Intellectual Property, LLC
Carrithers David W.
Carrithers Law Office PLLC
Ogden Necholus
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