Planetary gear transmission systems or components – With lubricaton
Reexamination Certificate
2007-01-16
2007-01-16
Choi, Ling-Sui (Department: 1713)
Planetary gear transmission systems or components
With lubricaton
C475S269000, C508S582000, C508S416000
Reexamination Certificate
active
10930325
ABSTRACT:
Antifoam compositions for functional 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 foam in an engine oil or unwanted noise in an automobile transmission during operation, comprising lubricating the engine or transmission with a lubricating fluid containing the antifoam compositions of the invention.
REFERENCES:
patent: 5385686 (1995-01-01), Miller et al.
Calcut Brent D.
Chapaton Thomas J.
Jones Marie-Christine G.
Sarkar Reuben
Choi Ling-Sui
General Motors Corporation
Sastri Satya
Thompson Dan L.
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