US PATENT SUBCLASS 417 / 423.4
.~.~.~ Turbomolecular pump

Current as of: June, 1999
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417 /   HD   PUMPS

321  DF  MOTOR DRIVEN {32}
410.1  DF  .~ Electric or magnetic motor {10}
423.1  DF  .~.~ Rotary motor and rotary nonexpansible chamber pump {13}
423.4.~.~.~ Turbomolecular pump

DEFINITION

Classification: 417/423.4

(under subclass 423.1) Apparatus wherein the pump has rapidly rotating fins to impart a high momentum to gas molecules to achieve a high vacuum.