VACUUM SYSTEM
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United States of America Patent
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Issued Date -
May 31, 2012
app pub date -
Mar 30, 2010
filing date -
Aug 14, 2009
priority date (Note) -
Abandoned
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Abstract
The invention provides a vacuum system (12) comprising a plurality of vacuum chambers (14, 16, 18, 20) connected in series and a vacuum pumping arrangement (10) for differential pumping the chambers. The vacuum pumping arrangement comprises a primary pump (22) having an inlet (23) connected for pumping a first vacuum chamber (14) and an outlet (25) for exhausting at or around atmosphere, a booster pump (24) having an inlet (27) connected for pumping a second vacuum chamber (16) and an outlet (29) connected to the inlet (23) of the primary pump; and a secondary pump (26, 28) having an inlet (31, 33) connected for pumping a third vacuum chamber (18, 20) and an outlet (35, 37) connected to the inlet (27) of the booster pump.
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