Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Organic oxygen compound
Reexamination Certificate
2006-08-29
2006-08-29
McAvoy, Ellen M. (Department: 1764)
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Organic oxygen compound
C252S077000
Reexamination Certificate
active
07098173
ABSTRACT:
Antifoam compositions for automatic transmission fluids contain antifoam agents comprising perfluoropolyether compounds (PFPE). An automatic transmission fluid is provided containing the antifoam composition in a lubricating base oil, along with conventional additives such as antiwear agents. Automobile transmissions are provided that contain an automatic transmission fluid containing the new antifoam compositions. In a further embodiment, methods are provided for reducing unwanted noise in an automobile transmission during operation, comprising lubricating the transmission with an ATF containing the antifoam compositions of the invention.
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Calcut Brent D.
Chapaton Thomas J.
Jones Marie-Christine G.
Sarkar Reuben
DeVries Christopher
General Motors Corporation
McAvoy Ellen M.
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