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US Patent 7658065 Hydraulic system having in-sump energy recovery device

Patent 7658065 was granted and assigned to Caterpillar Inc. on February, 2010 by the United States Patent and Trademark Office.

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Patent abstract

A hydraulic energy recovery device for a hydraulic system is disclosed. The hydraulic energy recovery device has a first impeller configured to receive a flow of pressurized liquid, and a second impeller configured to pressurize a flow of liquid. The hydraulic energy recovery device also has a common shaft connecting the first and second impellers.

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