Pump rotor seal apparatus and method
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United States of America Patent
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Jul 21, 2009
Grant Date -
Oct 18, 2007
app pub date -
Apr 18, 2006
filing date -
Apr 18, 2006
priority date (Note) -
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Abstract
An improved pump and pumping method includes a circumferential positive displacement pump having two counter rotating rotors. A clearance gap is defined between the rotor shaft, and a body hub portion of the body that forms the chamber.
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