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US 6,644,912 B2Granted
Gas friction pump
AssigneePfeiffer Vacuum GmbH
InventorArmin Conrad
Life of this patent
Estimating the term…
Abstract
A gas friction pump, including a housing having a suction opening, a gas outlet opening, and a plurality of rotatable and stationary components arranged in the housing and having a pump-active structure for pumping gases and maintaining a pressure ratio, and an additional gas inlet formed as a longitudinal opening extending, in a longitudinal direction thereof, over a portion of an outer edge of a rotatable component.
Claims1
A gas friction pump, comprising a housing having a suction opening, a gas outlet opening, and an additional gas inlet;
- and a plurality of rotatable and stationary components arranged in the housing and having a pump-active structure for pumping gases and maintaining a pressure ratio,
- wherein the additional gas inlet is formed as a longitudinal opening extending, in a circumferential direction thereof, over a portion of an outer edge of a rotatable component.
Dependencies are inferred from the claim text.