Composite vacuum pump
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United States of America Patent
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-
Mar 3, 1992
Grant Date -
N/A
app pub date -
Apr 27, 1989
filing date -
Apr 30, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A composite vacuum pump system having first and second vacuum pumps each having its own rotor and drive motor in which the exhaust of the first vacuum pump is removably coupled to the inlet of the second vacuum pump and the first vacuum pump rotor is driven at a constant torque and in which the second vacuum pump has an inlet for permitting the introduction into the pump of a heavy gas for increasing the efficiency of the pumping system.
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