ROTOR FOR PUMP
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United States of America Patent
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app pub date -
Apr 23, 2012
filing date -
May 4, 2011
priority date (Note) -
Abandoned
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Abstract
The present invention relates to a rotor for a vacuum pump having a roots pumping mechanism, the rotor comprising at least two hollow lobes, each lobe having an outer wall which defines a lobe profile, a hollow cavity generally inward of the outer wall, and at least one strengthening rib located in the cavity to resist stress on the lobes generated during rotation.
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