Progressive cavity helical device
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United States of America Patent
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Oct 8, 2002
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N/A
app pub date -
Jan 18, 2001
filing date -
Apr 24, 1996
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Abstract
A progressive cavity helical device which includes a stator with an internal helical cavity. A helical rotor operates within the internal helical cavity of the stator. The rotor has a mandrel of metal, plastic or composite material and an outer covering of elastomeric or resilient material.
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