The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 08, 2006
Filed:
Feb. 12, 2003
Reuben Sarkar, Novi, MI (US);
Brent D. Calcut, Allen Park, MI (US);
Thomas J. Chapaton, Sterling Heights, MI (US);
Marie-christine G. Jones, Bingham Farms, MI (US);
Reuben Sarkar, Novi, MI (US);
Brent D. Calcut, Allen Park, MI (US);
Thomas J. Chapaton, Sterling Heights, MI (US);
Marie-Christine G. Jones, Bingham Farms, MI (US);
General Motors Corporation, Detroit, MI (US);
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.