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US Patent 7759532 Refrigerant additive compositions containing perfluoropolyethers

Patent 7759532 was granted and assigned to E.I. Du Pont De Nemours And Company on July, 2010 by the United States Patent and Trademark Office.

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Patent abstract

The present invention relates to compositions and processes of using perfluoropolyether to maintain or improve the oil return, lubrication, cooling capacity, or energy efficiency of a refrigeration, air conditioning or heat transfer system.

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